Run tests on PHP 8.4 and update test environment

Author: WyriHaximus

.github/workflows/ci.yml

@@ -7,10 +7,11 @@ on:
 jobs:
   PHPUnit:
     name: PHPUnit (PHP ${{ matrix.php }})
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     strategy:
       matrix:
         php:
+          - 8.4
           - 8.3
           - 8.2
           - 8.1
@@ -43,11 +44,12 @@ jobs:
 
   PHPUnit-Unstable:
     name: PHPUnit (Unstable PHP ${{ matrix.php }})
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     continue-on-error: true
     strategy:
       matrix:
         php:
+          - 8.4
           - 8.3
           - 8.2
           - 8.1
@@ -106,11 +108,12 @@ jobs:
 
   PHPUnit-Windows:
     name: PHPUnit (PHP ${{ matrix.php }} on Windows)
-    runs-on: windows-2022
+    runs-on: windows-2024
     continue-on-error: true
     strategy:
       matrix:
         php:
+          - 8.4
           - 8.3
           - 8.2
           - 8.1