Update actions/checkout to v4

.github/workflows/audit-on-push.yml

@@ -8,7 +8,7 @@ jobs:
   security_audit:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v4
       - uses: actions-rs/audit-check@v1
         with:
           token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/book.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Cache dependencies
         id: cache-dependencies

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
   tests-argmin:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
       - name: Test (default features)
         run: cargo test -p argmin
@@ -24,7 +24,7 @@ jobs:
   tests-argmin-serde1-feature:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: Swatinem/rust-cache@v2
       - uses: dtolnay/rust-toolchain@stable
       - name: Test (no default features)
@@ -35,7 +35,7 @@ jobs:
   tests-argmin-observer-slog:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: Swatinem/rust-cache@v2
       - uses: dtolnay/rust-toolchain@stable
       - name: Test without default features
@@ -46,7 +46,7 @@ jobs:
   tests-argmin-observer-paramwriter:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: Swatinem/rust-cache@v2
       - uses: dtolnay/rust-toolchain@stable
       - name: Test 
@@ -55,7 +55,7 @@ jobs:
   tests-argmin-observer-spectator:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: Swatinem/rust-cache@v2
       - uses: dtolnay/rust-toolchain@stable
       - name: Test (spectator observer)
@@ -66,7 +66,7 @@ jobs:
   tests-argmin-math:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: Swatinem/rust-cache@v2
       - uses: dtolnay/rust-toolchain@stable
       # NOTE: These are in series on purpose, in the hope that not everything
@@ -109,7 +109,7 @@ jobs:
   clippy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: Swatinem/rust-cache@v2
       - uses: dtolnay/rust-toolchain@beta
         with:
@@ -132,7 +132,7 @@ jobs:
   rustfmt:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: Swatinem/rust-cache@v2
       - uses: dtolnay/rust-toolchain@beta
         with:
@@ -142,7 +142,7 @@ jobs:
   docs-build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: Swatinem/rust-cache@v2
       - uses: dtolnay/rust-toolchain@stable
       - name: argmin docs
@@ -153,7 +153,7 @@ jobs:
   wasm-build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: Swatinem/rust-cache@v2
       - uses: dtolnay/rust-toolchain@stable
         with:
@@ -179,7 +179,7 @@ jobs:
     continue-on-error: ${{ matrix.checks == 'advisories' }}
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - uses: EmbarkStudios/cargo-deny-action@v1
       with:
         command: check ${{ matrix.checks }}

.github/workflows/coverage.yml

@@ -13,7 +13,7 @@ jobs:
       CARGO_TERM_COLOR: always
     steps:
       - name: Checkout repository,
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - uses: Swatinem/rust-cache@v2
       - uses: dtolnay/rust-toolchain@nightly
@@ -29,4 +29,4 @@ jobs:
         with:
           #token: ${{ secrets.CODECOV_TOKEN }} # not required for public repos
           files: lcov.info
-          fail_ci_if_error: true
+          fail_ci_if_error: true

.github/workflows/docs.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: Swatinem/rust-cache@v2
       - uses: dtolnay/rust-toolchain@stable
         with:

.github/workflows/scheduled-audit.yml

@@ -6,7 +6,7 @@ jobs:
   audit:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v4
       - uses: actions-rs/audit-check@v1
         with:
           token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/spellcheck.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout Actions Repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
 
     - name: Check spelling
-      uses: crate-ci/typos@master
+      uses: crate-ci/typos@master

.github/workflows/website.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Build website 
         uses: shalzz/zola-deploy-action@master