Exclude spock milesone versions (#552)

* Excluding spock groovy 4

* Exclude all milestone versions

Author: sebastian-peter

.github/dependabot.yml

@@ -17,8 +17,14 @@ updates:
   ignore:
   - dependency-name: org.spockframework:spock-core
     versions:
-        - "2.1-groovy-3.0-SNAPSHOT"
-        - "2.1-groovy-2.5-SNAPSHOT"
-        - "2.2-groovy-4.0-SNAPSHOT"
-        - "2.2-groovy-3.0-SNAPSHOT"
-        - "2.2-groovy-2.5-SNAPSHOT"
+        - 2.1-groovy-2.5-SNAPSHOT
+        - 2.1-groovy-3.0-SNAPSHOT
+        - 2.2-groovy-2.5-SNAPSHOT
+        - 2.2-groovy-3.0-SNAPSHOT
+        - 2.2-groovy-4.0-SNAPSHOT
+        - 2.2-M1-groovy-2.5
+        - 2.2-M1-groovy-3.0
+        - 2.2-M1-groovy-4.0
+        - 2.2-M2-groovy-2.5
+        - 2.2-M2-groovy-3.0
+        - 2.2-M2-groovy-4.0