Only allow PHP >= 8.4 to fail

PHP 8.3 has been released: https://externals.io/message/121782

Author: thekid

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ jobs:
     if: "!contains(github.event.head_commit.message, 'skip ci')"
     name: PHP ${{ matrix.php-versions }} on ${{ matrix.os }}
     runs-on: ${{ matrix.os }}
-    continue-on-error: ${{ matrix.php-versions >= '8.3' }}
+    continue-on-error: ${{ matrix.php-versions >= '8.4' }}
     strategy:
       fail-fast: false
       matrix: