Run CI with php 8.5 and add php 8.6 to the testing matrix (#2092)

Author: jderusse

.github/workflows/checks.yml

@@ -28,7 +28,7 @@ jobs:
       - name: Install PHP with extensions
         uses: shivammathur/setup-php@v2
         with:
-          php-version: 8.3
+          php-version: 8.5
           tools: composer:v2
 
       - name: Install roave/backward-compatibility-check

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       max-parallel: 10
       matrix:
-        php: ['8.2', '8.3', '8.4', '8.5']
+        php: ['8.2', '8.3', '8.4', '8.5', '8.6']
 
     steps:
       - name: Set up PHP