update Dockerfile for go 1.21.3 (#1752)

Signed-off-by: Bob Callaway <[email protected]>

Dockerfile

@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM golang:1.21.2@sha256:e9ebfe932adeff65af5338236f0b0604c86b143c1bff3e1d0551d8f6196ab5c5 AS builder
+FROM golang:1.21.3@sha256:02d7116222536a5cf0fcf631f90b507758b669648e0f20186d2dc94a9b419a9b AS builder
 ENV APP_ROOT=/opt/app-root
 ENV GOPATH=$APP_ROOT
 
@@ -31,7 +31,7 @@ RUN CGO_ENABLED=0 go build -gcflags "all=-N -l" -ldflags "${SERVER_LDFLAGS}" -o
 RUN go test -c -ldflags "${SERVER_LDFLAGS}" -cover -covermode=count -coverpkg=./... -o rekor-server_test ./cmd/rekor-server
 
 # Multi-Stage production build
-FROM golang:1.21.2@sha256:e9ebfe932adeff65af5338236f0b0604c86b143c1bff3e1d0551d8f6196ab5c5 as deploy
+FROM golang:1.21.3@sha256:02d7116222536a5cf0fcf631f90b507758b669648e0f20186d2dc94a9b419a9b as deploy
 
 # Retrieve the binary from the previous stage
 COPY --from=builder /opt/app-root/src/rekor-server /usr/local/bin/rekor-server