Bump sigstore/cosign-installer from 1.3.0 to 1.3.1 (#491)

Bumps [sigstore/cosign-installer](https://github.com/sigstore/cosign-installer) from 1.3.0 to 1.3.1.
- [Release notes](https://github.com/sigstore/cosign-installer/releases)
- [Commits](https://github.com/sigstore/cosign-installer/compare/v1.3.0...v1.3.1

)

---
updated-dependencies:
- dependency-name: sigstore/cosign-installer
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/build.yml

@@ -30,7 +30,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v2.4.0
-      - uses: sigstore/cosign-installer@v1.3.0
+      - uses: sigstore/cosign-installer@v1.3.1
 
       - name: Extract version of Go to use
         run: echo "GOVERSION=$(cat Dockerfile|grep golang | awk ' { print $2 } ' | sed -r 's/^.*://g'| uniq)" >> $GITHUB_ENV