build(deps): bump sigstore/cosign-installer from 3.0.2 to 3.0.3

Bumps [sigstore/cosign-installer](https://github.com/sigstore/cosign-installer) from 3.0.2 to 3.0.3.
- [Release notes](https://github.com/sigstore/cosign-installer/releases)
- [Commits](sigstore/cosign-installer@9e9de22...204a51a)

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

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

Author: dependabot[bot]

.github/workflows/release.yml

@@ -78,7 +78,7 @@ jobs:
           docker buildx imagetools inspect ghcr.io/fluxcd/${{ env.CONTROLLER }}:${{ steps.prep.outputs.VERSION }}
           docker pull docker.io/fluxcd/${{ env.CONTROLLER }}:${{ steps.prep.outputs.VERSION }}
           docker pull ghcr.io/fluxcd/${{ env.CONTROLLER }}:${{ steps.prep.outputs.VERSION }}
-      - uses: sigstore/cosign-installer@9e9de2292db7abb3f51b7f4808d98f0d347a8919 # v3.0.2
+      - uses: sigstore/cosign-installer@204a51a57a74d190b284a0ce69b44bc37201f343 # v3.0.3
       - name: Sign images
         env:
           COSIGN_EXPERIMENTAL: 1