Update check workflow to use spotless for kotlin

Signed-off-by: Álvaro Brey <alvaro.brey@nextcloud.com>

.github/workflows/check.yml

@@ -13,7 +13,7 @@ jobs:
         strategy:
             fail-fast: false
             matrix:
-                task: [ detekt, ktlintCheck ]
+                task: [ detekt, spotlessKotlinCheck ]
         steps:
             -   uses: actions/checkout@v3
             -   name: Set up JDK 11