Revert "Fix: Continue on error when running tests on PHP 8.3"

This reverts commit 5ba0bd8.

Author: sebastianbergmann

.github/workflows/ci.yml

@@ -103,13 +103,7 @@ jobs:
       - name: Install dependencies with Composer
         run: ./tools/composer update --no-ansi --no-interaction --no-progress
 
-      - name: Run tests with PHPUnit on stable PHP version
-        if: matrix.php-version != '8.3'
-        run: ./phpunit --testsuite unit
-
-      - name: Run tests with PHPUnit on unstable PHP version
-        if: matrix.php-version == '8.3'
-        continue-on-error: true
+      - name: Run tests with PHPUnit
         run: ./phpunit --testsuite unit
 
   end-to-end-tests:
@@ -159,13 +153,7 @@ jobs:
       - name: Install dependencies with Composer
         run: ./tools/composer update --no-ansi --no-interaction --no-progress
 
-      - name: Run tests with PHPUnit on stable PHP version
-        if: matrix.php-version != '8.3'
-        run: ./phpunit --testsuite end-to-end
-
-      - name: Run tests with PHPUnit on unstable PHP version
-        if: matrix.php-version == '8.3'
-        continue-on-error: true
+      - name: Run tests with PHPUnit
         run: ./phpunit --testsuite end-to-end
 
   code-coverage: