Update actions versions (#91)

Author: matthewelwell

.github/workflows/pull-requests.yml

@@ -18,7 +18,7 @@ jobs:
 
     steps:
       - name: Cloning repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
           submodules: recursive
@@ -35,7 +35,7 @@ jobs:
         run: echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
 
       - name: Cache dependencies
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: ${{ steps.composer-cache.outputs.dir }}
           key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}