Bump steep from 1.7.0.dev.4 to 1.7.1

Bumps [steep](https://github.com/soutaro/steep) from 1.7.0.dev.4 to 1.7.1.
- [Release notes](https://github.com/soutaro/steep/releases)
- [Changelog](https://github.com/soutaro/steep/blob/master/CHANGELOG.md)
- [Commits](soutaro/steep@v1.7.0.dev.4...v1.7.1)

---
updated-dependencies:
- dependency-name: steep
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile

@@ -42,5 +42,5 @@ group :minitest do
 end
 
 group :typecheck_test do
-  gem "steep", "~> 1.7.0.dev", require: false
+  gem "steep", "~> 1.7.1", require: false
 end

Gemfile.lock

@@ -118,7 +118,7 @@ GEM
     ruby-progressbar (1.13.0)
     securerandom (0.3.1)
     stackprof (0.2.26)
-    steep (1.7.0.dev.4)
+    steep (1.7.1)
       activesupport (>= 5.1)
       concurrent-ruby (>= 1.1.10)
       csv (>= 3.0.9)
@@ -177,7 +177,7 @@ DEPENDENCIES
   rubocop
   rubocop-rubycw
   stackprof
-  steep (~> 1.7.0.dev)
+  steep (~> 1.7.1)
   tempfile
   test-unit