Update actions/cache action to v6 (#801)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci.yml

@@ -23,7 +23,7 @@ jobs:
         with:
           node-version: 18.20.0
 
-      - uses: actions/cache@5a3ec84eff668545956fd18022155c47e93e2684 # v4.2.3
+      - uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
         with:
           path: node_modules
           key: npm-${{ hashFiles('package-lock.json') }}