Merge pull request #2557 from DFE-Digital/update-gh-action-versions

Upgrade actions/cache on github actions

.github/actions/prepare-app-env/action.yml

@@ -41,7 +41,7 @@ runs:
 
     - name: Set up yarn cache
       if: ${{ inputs.skip-node == 'false' }}
-      uses: actions/cache@v2.1.7
+      uses: actions/cache@v4
       with:
         path: ${{ steps.yarn-cache.outputs.dir }}
         key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}