GH Actions: update PHP versions in workflows

PHP 8.2 has long been released and PHP 8.3 is nearing the first RC, so I propose adding PHP 8.3 to the matrix and no longer allowing PHP 8.2 to fail the build.

Builds against PHP 8.3 are still allowed to fail for now.

.github/workflows/ci.yml

@@ -38,9 +38,9 @@ jobs:
     strategy:
       matrix:
         operating-system: ['ubuntu-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']
 
-    continue-on-error: ${{ matrix.php-versions == '8.2' }}
+    continue-on-error: ${{ matrix.php-versions == '8.3' }}
 
     steps:
       - name: Checkout
@@ -54,12 +54,12 @@ jobs:
           ini-values: error_reporting=-1, display_errors=On
           coverage: none
 
-      - name: Install Composer dependencies (PHP < 8.2)
-        if: ${{ matrix.php-versions != '8.2' }}
+      - name: Install Composer dependencies (PHP < 8.3)
+        if: ${{ matrix.php-versions != '8.3' }}
         uses: "ramsey/composer-install@v2"
 
-      - name: Install Composer dependencies - ignore-platform-reqs (PHP 8.2)
-        if: ${{ matrix.php-versions == '8.2' }}
+      - name: Install Composer dependencies - ignore-platform-reqs (PHP 8.3)
+        if: ${{ matrix.php-versions == '8.3' }}
         uses: "ramsey/composer-install@v2"
         with:
           composer-options: --ignore-platform-reqs