CI: bump action version

.github/workflows/main.yml

@@ -29,7 +29,7 @@ jobs:
           echo "minute=$(date +'%M')" >> $GITHUB_OUTPUT
           echo "second=$(date +'%S')" >> $GITHUB_OUTPUT
       - name: Cache cache.db
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: |
             .cache