Update deprecated GitHub Actions to latest versions

Co-authored-by: lisachenko <[email protected]>

Author: Copilot

.github/workflows/phpstan.yml

@@ -9,15 +9,15 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: "Checkout"
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: "Install PHP"
         uses: shivammathur/setup-php@v2
         with:
           php-version: "8.2"
           ini-values: memory_limit=-1
           tools: composer:v2
       - name: "Cache dependencies"
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: |
             ~/.composer/cache

.github/workflows/phpunit.yml

@@ -23,7 +23,7 @@ jobs:
 
     steps:
       - name: "Checkout"
-        uses: "actions/checkout@v2"
+        uses: "actions/checkout@v4"
 
       - name: "Install PHP"
         uses: "shivammathur/setup-php@v2"
@@ -34,7 +34,7 @@ jobs:
           tools: composer:v2, cs2pr
 
       - name: "Cache dependencies"
-        uses: "actions/cache@v2"
+        uses: "actions/cache@v4"
         with:
           path: |
             ~/.composer/cache