chore(deps): bump sigstore/cosign-installer from 4.1.1 to 4.1.2

Bumps [sigstore/cosign-installer](https://github.com/sigstore/cosign-installer) from 4.1.1 to 4.1.2.
- [Release notes](https://github.com/sigstore/cosign-installer/releases)
- [Commits](https://github.com/sigstore/cosign-installer/compare/v4.1.1...v4.1.2)

---
updated-dependencies:
- dependency-name: sigstore/cosign-installer
  dependency-version: 4.1.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

.github/workflows/helm-chart.yml

@@ -46,7 +46,7 @@ jobs:
 
       - name: Install cosign
         if: steps.check.outputs.new == 'true'
-        uses: sigstore/cosign-installer@v4.1.1
+        uses: sigstore/cosign-installer@v4.1.2
 
       - name: Sign chart with cosign
         if: steps.check.outputs.new == 'true'