build(deps): Bump actions/attest-build-provenance

Bumps the github-actions group with 1 update: [actions/attest-build-provenance](https://github.com/actions/attest-build-provenance).


Updates `actions/attest-build-provenance` from 1.3.3 to 1.4.0
- [Release notes](https://github.com/actions/attest-build-provenance/releases)
- [Changelog](https://github.com/actions/attest-build-provenance/blob/main/RELEASE.md)
- [Commits](actions/attest-build-provenance@5e9cb68...210c191)

---
updated-dependencies:
- dependency-name: actions/attest-build-provenance
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: github-actions
...

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

.github/workflows/at_server.yaml

@@ -157,7 +157,7 @@ jobs:
         run: |
           echo "hashes=$(cat checksums.txt | base64 -w0)" >> "$GITHUB_OUTPUT"
       - if: ${{ matrix.dart-channel == 'stable' && startsWith(github.ref, 'refs/tags/') }}
-        uses: actions/attest-build-provenance@5e9cb68e95676991667494a6a4e59b8a2f13e1d0 # v1.3.3
+        uses: actions/attest-build-provenance@210c1913531870065f03ce1f9440dd87bc0938cd # v1.4.0
         with:
           subject-path: 'sboms/**'
 

.github/workflows/promote_canary.yaml

@@ -164,7 +164,7 @@ jobs:
         working-directory: sboms
         run: |
           echo "hashes=$(cat checksums.txt | base64 -w0)" >> "$GITHUB_OUTPUT"
-      - uses: actions/attest-build-provenance@5e9cb68e95676991667494a6a4e59b8a2f13e1d0 # v1.3.3
+      - uses: actions/attest-build-provenance@210c1913531870065f03ce1f9440dd87bc0938cd # v1.4.0
         with:
           subject-path: 'sboms/**'