Fix GitHub actions deprecations. Add PHP 8.3 to CI runs.

.github/workflows/build.yml

@@ -6,7 +6,7 @@ jobs:
     strategy:
       matrix:
         operating-system: [ubuntu-latest, windows-latest]
-        php-versions: ['7.1', '7.2', '7.3', '7.4', '8.0', '8.1', '8.2']
+        php-versions: ['7.1', '7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3']
     name: PHP ${{ matrix.php-versions }} Test on ${{ matrix.operating-system }}
     steps:
       - name: Checkout
@@ -21,7 +21,7 @@ jobs:
 
       - name: Get Composer Cache Directory
         id: composer-cache
-        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+        run: echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
 
       - name: Install Composer dependencies
         if: ${{ matrix.php-versions != '8.1' }}
@@ -32,7 +32,7 @@ jobs:
         run: composer install --no-progress --no-suggest --prefer-dist --optimize-autoloader --ignore-platform-reqs
 
       - name: Cache dependencies
-        uses: actions/cache@v1
+        uses: actions/cache@v4
         with:
           path: ${{ steps.composer-cache.outputs.dir }}
           key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}