Update dependency on actions/cache

Closes: gh-15

action.yaml

@@ -78,7 +78,7 @@ runs:
       uses: WillAbides/[email protected]
       with:
         go-version: "stable"
-    - uses: actions/cache@v3
+    - uses: actions/cache@v4
       if: ${{ inputs.merge-files == '' }}
       with:
         path: |