chore(deps): bump the ci group with 2 updates

Bumps the ci group with 2 updates: [DeterminateSystems/nix-installer-action](https://github.com/determinatesystems/nix-installer-action) and [anchore/sbom-action](https://github.com/anchore/sbom-action).


Updates `DeterminateSystems/nix-installer-action` from 14 to 15
- [Release notes](https://github.com/determinatesystems/nix-installer-action/releases)
- [Commits](DeterminateSystems/nix-installer-action@v14...v15)

Updates `anchore/sbom-action` from 0.17.6 to 0.17.7
- [Release notes](https://github.com/anchore/sbom-action/releases)
- [Changelog](https://github.com/anchore/sbom-action/blob/main/RELEASE.md)
- [Commits](anchore/sbom-action@251a468...fc46e51)

---
updated-dependencies:
- dependency-name: DeterminateSystems/nix-installer-action
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: ci
- dependency-name: anchore/sbom-action
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: ci
...

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

.github/workflows/flake_vendorhash.yaml

@@ -25,7 +25,7 @@ jobs:
         with:
           token: ${{ steps.generate_token.outputs.token }}
       - name: Install Nix
-        uses: DeterminateSystems/nix-installer-action@v14
+        uses: DeterminateSystems/nix-installer-action@v15
       - name: Update ocm vendor hash
         run: nix run .#nixpkgs.nix-update -- --flake --version=skip ocm
       - name: Check diff and create action summary

.github/workflows/release.yaml

@@ -141,7 +141,7 @@ jobs:
         cache_name: ocm-cli-latest-go-cache # needs to be the same key in the end as in the build step
 
     - name: Setup Syft
-      uses: anchore/sbom-action/download-syft@251a468eed47e5082b105c3ba6ee500c0e65a764 # v0.17.6
+      uses: anchore/sbom-action/download-syft@fc46e51fd3cb168ffb36c6d1915723c47db58abb # v0.17.7
 
     - name: Setup Cosign
       uses: sigstore/[email protected]