Fix action versions

Author: walking-octopus

.github/workflows/ci.yml

@@ -11,9 +11,9 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4.2.2
 
-      - uses: actions/cache@v2
+      - uses: actions/cache@v4.2.3
         name: Cache installed packages
         with:
           path: |