chore: Set minimum OCP version to 27

We have to require a version of nextcloud/ocp that contains the classes we
 use in the tested sets. Otherwise tests for 26 and 27 sets will fail
 when pulling the lowest version of dependendies.

Signed-off-by: Côme Chilliet <come.chilliet@nextcloud.com>

Author: come-nc

composer.json

@@ -16,7 +16,7 @@
     ],
     "require": {
         "php": "^8.1",
-        "nextcloud/ocp": "*",
+        "nextcloud/ocp": ">=27",
         "rector/rector": "^2.0"
     },
     "require-dev": {