Update GitHub workflows

Author: dshevtsov

.github/workflows/publish.yml

@@ -63,7 +63,7 @@ jobs:
           cache-dependency-path: 'yarn.lock'
 
       - name: Gatsby Cache
-        uses: actions/cache@v3.3.2
+        uses: actions/cache@v4
         with:
           path: |
             public

.github/workflows/stage.yml

@@ -74,7 +74,7 @@
             cache-dependency-path: 'yarn.lock'
 
         - name: Gatsby Cache
-          uses: actions/cache@v3.3.2
+          uses: actions/cache@v4
           with:
             path: |
               public