GH Actions: PHP 8.4 has been released

* Builds against PHP 8.4 are no longer allowed to fail.
* Add _allowed to fail_ build against PHP 8.5.

Ref: https://www.php.net/releases/8.4/en.php

Author: jrfnl

.github/workflows/run-tests.yml

@@ -25,7 +25,7 @@ jobs:
 
     strategy:
       matrix:
-        php: ['8.3', '8.2', '8.1', '8.0', '7.4', '7.3', '7.2', '7.1', '7.0', '5.6', '5.5', '5.4']
+        php: ['8.4', '8.3', '8.2', '8.1', '8.0', '7.4', '7.3', '7.2', '7.1', '7.0', '5.6', '5.5', '5.4']
         dependency-version: ['prefer-stable']
         experimental: [false]
 
@@ -51,8 +51,11 @@ jobs:
           - php: '8.3'
             dependency-version: 'prefer-lowest'
             experimental: false
-
           - php: '8.4'
+            dependency-version: 'prefer-lowest'
+            experimental: false
+
+          - php: '8.5'
             dependency-version: 'prefer-stable'
             experimental: true
 
@@ -85,12 +88,12 @@ jobs:
       run: composer require --no-update phpunit/phpunit:"^9.0" --no-interaction
 
     - name: Install dependencies - normal
-      if: ${{ matrix.php < 8.4 }}
+      if: ${{ matrix.php < 8.5 }}
       run: |
         composer update --${{ matrix.dependency-version }} --prefer-dist --no-progress --no-interaction
 
     - name: Install dependencies - ignore platform reqs
-      if: ${{ matrix.php >= 8.4 }}
+      if: ${{ matrix.php >= 8.5 }}
       run: |
         composer update --${{ matrix.dependency-version }} --prefer-dist --no-progress --ignore-platform-req=php+ --no-interaction