Adjust testing matrix for Nextcloud 25 on master

Signed-off-by: Joas Schilling <coding@schilljs.com>

.github/workflows/phpunit-mysql.yml

@@ -44,7 +44,7 @@ jobs:
     strategy:
       matrix:
         php-versions: ['7.4', '8.0', '8.1']
-        server-versions: ['master']
+        server-versions: ['master', 'stable25']
 
     services:
       mysql:

.github/workflows/static-analysis.yml

@@ -7,7 +7,7 @@ jobs:
       runs-on: ubuntu-latest
       strategy:
           matrix:
-              ocp-version: [ 'dev-master' ]
+              ocp-version: [ 'dev-master', 'dev-stable25' ]
       name: Nextcloud ${{ matrix.ocp-version }}
       steps:
           - name: Checkout