chore(deps): bump fluxcd/flux2 from 2.4.0 to 2.5.1 (#12359)

Bumps [fluxcd/flux2](https://github.com/fluxcd/flux2) from 2.4.0 to 2.5.1.
- [Release notes](https://github.com/fluxcd/flux2/releases)
- [Changelog](https://github.com/fluxcd/flux2/blob/main/.goreleaser.yml)
- [Commits](5350425cdc...8d5f40dca5)

---
updated-dependencies:
- dependency-name: fluxcd/flux2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

.github/workflows/release.yaml

@@ -283,7 +283,7 @@ jobs:
         uses: ./.github/actions/setup-build-env
         timeout-minutes: 10
       - name: Setup Flux CLI
-        uses: fluxcd/flux2/action@5350425cdcd5fa015337e09fa502153c0275bd4b # v2.4.0
+        uses: fluxcd/flux2/action@8d5f40dca5aa5d3c0fc3414457dda15a0ac92fa4 # v2.5.1
         with:
           version: 0.35.0
       - name: Install Cosign