fix(ci): use matrix server-versions branch for notifications and activity clone

Signed-off-by: Vitor Mattos <1079143+vitormattos@users.noreply.github.com>

Author: vitormattos

.github/workflows/playwright.yml

@@ -161,10 +161,10 @@ jobs:
             --admin-pass admin
           ./occ --version
           ./occ app:enable --force ${{ env.APP_NAME }}
-          git clone --depth 1 -b main https://github.com/nextcloud/notifications apps/notifications
+          git clone --depth 1 -b ${{ matrix.server-versions }} https://github.com/nextcloud/notifications apps/notifications
           composer --working-dir=apps/notifications install --no-dev
           ./occ app:enable --force notifications
-          git clone --depth 1 -b main https://github.com/nextcloud/activity apps/activity
+          git clone --depth 1 -b ${{ matrix.server-versions }} https://github.com/nextcloud/activity apps/activity
           composer --working-dir=apps/activity install --no-dev
           ./occ app:enable --force activity
           ./occ config:system:set allow_local_remote_servers --value true --type boolean