Bump the ci group with 3 updates

Bumps the ci group with 3 updates: [sigstore/cosign-installer](https://github.com/sigstore/cosign-installer), [anchore/sbom-action](https://github.com/anchore/sbom-action) and [docker/metadata-action](https://github.com/docker/metadata-action).


Updates `sigstore/cosign-installer` from 3.3.0 to 3.4.0
- [Release notes](https://github.com/sigstore/cosign-installer/releases)
- [Commits](sigstore/cosign-installer@9614fae...e1523de)

Updates `anchore/sbom-action` from 0.15.5 to 0.15.8
- [Release notes](https://github.com/anchore/sbom-action/releases)
- [Commits](anchore/sbom-action@24b0d52...b6a39da)

Updates `docker/metadata-action` from 5.5.0 to 5.5.1
- [Release notes](https://github.com/docker/metadata-action/releases)
- [Commits](docker/metadata-action@dbef880...8e5442c)

---
updated-dependencies:
- dependency-name: sigstore/cosign-installer
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: ci
- dependency-name: anchore/sbom-action
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: ci
- dependency-name: docker/metadata-action
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: ci
...

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

Author: dependabot[bot]

.github/workflows/release.yaml

@@ -50,8 +50,8 @@ jobs:
             **/go.mod
       - uses: docker/setup-qemu-action@68827325e0b33c7199eb31dd4e31fbe9023e06e3 # v3.0.0
       - uses: docker/setup-buildx-action@f95db51fddba0c2d1ec667646a06c2ce06100226 # v3.0.0
-      - uses: sigstore/cosign-installer@9614fae9e5c5eddabb09f90a270fcb487c9f7149 # v3.3.0
-      - uses: anchore/sbom-action/download-syft@24b0d5238516480139aa8bc6f92eeb7b54a9eb0a # v0.15.5
+      - uses: sigstore/cosign-installer@e1523de7571e31dbe865fd2e80c5c7c23ae71eb4 # v3.4.0
+      - uses: anchore/sbom-action/download-syft@b6a39da80722a2cb0ef5d197531764a89b5d48c3 # v0.15.8
       - name: Docker login ghcr.io
         uses: docker/login-action@343f7c4344506bcbf9b4de18042ae17996df046d # v3.0.0
         with:
@@ -65,7 +65,7 @@ jobs:
           password: ${{ secrets.DOCKER_FLUXCD_PASSWORD }}
       - name: Docker meta
         id: meta
-        uses: docker/metadata-action@dbef88086f6cef02e264edb7dbf63250c17cef6c # v5.5.0
+        uses: docker/metadata-action@8e5442c4ef9f78752691e2d8f8d19755c6f78e81 # v5.5.1
         with:
           images: |
             fluxcd/${{ env.CONTROLLER }}