chore: bump php version for unit tests to 8.2

Signed-off-by: Jana Peper <jana.peper@nextcloud.com>

Author: janepie

.github/workflows/phpunit.yml

@@ -35,7 +35,7 @@ jobs:
       # do not stop on another job's failure
       fail-fast: false
       matrix:
-        php-versions: ['8.1']
+        php-versions: ['8.2']
         databases: ['sqlite']
         server-versions: ['master']