update CI actions versions

Author: yurichechulin

.github/workflows/tests.yml

@@ -23,7 +23,7 @@ jobs: # Docs: <https://git.io/JvxXE>
         php: ['7.2', '7.3', '7.4', '8.0']
     steps:
       - name: Check out code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Setup PHP, with composer and extensions
         uses: shivammathur/setup-php@v2 # Action page: <https://github.com/shivammathur/setup-php>
@@ -36,7 +36,7 @@ jobs: # Docs: <https://git.io/JvxXE>
         run: echo "::set-output name=dir::$(composer config cache-files-dir)"
 
       - name: Cache dependencies # Docs: <https://git.io/JfAKn#php---composer>
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: ${{ steps.composer-cache.outputs.dir }}
           key: ${{ runner.os }}-composer-${{ matrix.setup }}-${{ hashFiles('**/composer.json') }}
@@ -76,7 +76,7 @@ jobs: # Docs: <https://git.io/JvxXE>
     runs-on: ubuntu-20.04
     steps:
       - name: Check out code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Lint changelog file
         uses: docker://avtodev/markdown-lint:v1 # Action page: <https://github.com/avto-dev/markdown-lint>