build(deps): bump the ci group with 1 update

Bumps the ci group with 1 update: [slsa-framework/slsa-github-generator](https://github.com/slsa-framework/slsa-github-generator).

- [Release notes](https://github.com/slsa-framework/slsa-github-generator/releases)
- [Changelog](https://github.com/slsa-framework/slsa-github-generator/blob/main/CHANGELOG.md)
- [Commits](https://github.com/slsa-framework/slsa-github-generator/compare/v1.7.0...v1.8.0)

---
updated-dependencies:
- dependency-name: slsa-framework/slsa-github-generator
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: ci
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/release.yaml

@@ -176,7 +176,7 @@ jobs:
       actions: read # for detecting the Github Actions environment.
       id-token: write # for creating OIDC tokens for signing.
       contents: write # for uploading attestations to GitHub releases.
-    uses: slsa-framework/slsa-github-generator/.github/workflows/generator_generic_slsa3.yml@v1.7.0
+    uses: slsa-framework/slsa-github-generator/.github/workflows/generator_generic_slsa3.yml@v1.8.0
     with:
       provenance-name: "provenance.intoto.jsonl"
       base64-subjects: "${{ needs.release-flux-cli.outputs.hashes }}"
@@ -188,7 +188,7 @@ jobs:
       actions: read # for detecting the Github Actions environment.
       id-token: write # for creating OIDC tokens for signing.
       packages: write # for uploading attestations.
-    uses: slsa-framework/slsa-github-generator/.github/workflows/generator_container_slsa3.yml@v1.7.0
+    uses: slsa-framework/slsa-github-generator/.github/workflows/generator_container_slsa3.yml@v1.8.0
     with:
       image: ${{ needs.release-flux-cli.outputs.image_url }}
       digest: ${{ needs.release-flux-cli.outputs.image_digest }}
@@ -202,7 +202,7 @@ jobs:
       actions: read # for detecting the Github Actions environment.
       id-token: write # for creating OIDC tokens for signing.
       packages: write # for uploading attestations.
-    uses: slsa-framework/slsa-github-generator/.github/workflows/generator_container_slsa3.yml@v1.7.0
+    uses: slsa-framework/slsa-github-generator/.github/workflows/generator_container_slsa3.yml@v1.8.0
     with:
       image: ghcr.io/${{ needs.release-flux-cli.outputs.image_url }}
       digest: ${{ needs.release-flux-cli.outputs.image_digest }}