Don't ignore platform requirements for PHP 8.4.

All our dependencies should be PHP 8.4 compatible now.

.github/workflows/ci.yml

@@ -101,8 +101,6 @@ jobs:
       run: |
         if ${{ matrix.prefer-lowest == 'prefer-lowest' }}; then
           composer update --prefer-lowest --prefer-stable
-        elif ${{ matrix.php-version == '8.4' }}; then
-          composer update --ignore-platform-req=php
         else
           composer update
         fi