chore: update workflow checkout action version (#121)

Author: alexbarnsley

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
 
         steps:
             - name: Checkout code
-              uses: actions/checkout@v2
+              uses: actions/checkout@v4
               with:
                   ref: ${{ github.head_ref }}
 
@@ -26,7 +26,7 @@ jobs:
 
     #     steps:
     #         - name: Checkout code
-    #           uses: actions/checkout@v2
+    #           uses: actions/checkout@v4
 
     #         - name: Setup PHP
     #           uses: shivammathur/setup-php@v2
@@ -36,7 +36,7 @@ jobs:
     #               coverage: pcov
 
     #         - name: Cache dependencies
-    #           uses: actions/cache@v1
+    #           uses: actions/cache@v4
     #           with:
     #               path: ~/.composer/cache/files
     #               key: dependencies-composer-${{ hashFiles('composer.json') }}
@@ -57,7 +57,7 @@ jobs:
         runs-on: ubuntu-latest
 
         steps:
-            - uses: actions/checkout@v2
+            - uses: actions/checkout@v4
               with:
                   ref: ${{ github.head_ref }}
                   token: ${{ secrets.GH_TOKEN }}
@@ -89,7 +89,7 @@ jobs:
 
         steps:
             - name: Checkout code
-              uses: actions/checkout@v2
+              uses: actions/checkout@v4
               with:
                   ref: ${{ github.head_ref }}
 
@@ -101,7 +101,7 @@ jobs:
                   coverage: pcov
 
             - name: Cache dependencies
-              uses: actions/cache@v2
+              uses: actions/cache@v4
               with:
                   path: ~/.composer/cache/files
                   key: dependencies-composer-${{ hashFiles('composer.json') }}