ci: Bump github-action-benchmark and cache-nix-action to node24 releases

Both actions were still on the deprecated node20 runtime, triggering
Node.js 20 deprecation warnings in CI. github-action-benchmark v1.22.1
and cache-nix-action v7.0.2 both run on node24. cache-nix-action v7
caches only /nix by default.

Signed-off-by: Matthias J. Kannwischer <matthias@zerorisc.com>

Author: mkannwischer

.github/actions/bench/action.yml

@@ -94,7 +94,7 @@ runs:
       run: |
         check-namespace
     - name: Store benchmark result
-      uses: benchmark-action/github-action-benchmark@d48d326b4ca9ba73ca0cd0d59f108f9e02a381c7 # v1.20.4
+      uses: benchmark-action/github-action-benchmark@52576c92bccf6ac60c8223ec7eb2565637cae9ba # v1.22.1
       with:
         name: ${{ inputs.name }}
         tool: "customSmallerIsBetter"

.github/actions/setup-nix/action.yml

@@ -104,7 +104,7 @@ runs:
         fi
         nix config show
         echo "::endgroup::"
-    - uses: nix-community/cache-nix-action@dab0514428ae3988852b7787a6d86a6fc571cc9d #v6.0.0
+    - uses: nix-community/cache-nix-action@7df957e333c1e5da7721f60227dbba6d06080569 # v7.0.2
       id: cache
       if: ${{ env.NIX_CACHE_ENABLED != 1 && inputs.cache == 'true' }}
       continue-on-error: true