chore(deps): bump sigstore/cosign-installer from 3.8.2 to 3.9.0 (#4942)

Bumps [sigstore/cosign-installer](https://github.com/sigstore/cosign-installer) from 3.8.2 to 3.9.0.
- [Release notes](https://github.com/sigstore/cosign-installer/releases)
- [Commits](https://github.com/sigstore/cosign-installer/compare/3454372f43399081ed03b604cb2d021dabca52bb...fb28c2b6339dcd94da6e4cbcbc5e888961f6f8c3)

---
updated-dependencies:
- dependency-name: sigstore/cosign-installer
  dependency-version: 3.9.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

.github/workflows/helm.yml

@@ -133,7 +133,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Install cosign
-        uses: sigstore/cosign-installer@3454372f43399081ed03b604cb2d021dabca52bb # v3.8.2
+        uses: sigstore/cosign-installer@398d4b0eeef1380460a10c8013a76f728fb906ac # v3.9.1
         with:
           cosign-release: 'v2.4.1'