Remove redundant compatibility testing

The Maven extension controls the version of the Develocity extension
with which it is used so there's no need to perform compatibility
testing with other versions.

develocity-conventions-maven-extension/build.gradle

@@ -2,7 +2,6 @@ plugins {
 	id "build-conventions"
 	id "java"
 	id "maven-publish"
-	id "io.spring.compatibility-test" version "0.0.2"
 }
 
 description = "Develocity Conventions Maven extension"
@@ -14,7 +13,7 @@ repositories {
 dependencies {
 	compileOnly("org.apache.maven:maven-core:3.6.3")
 	compileOnly("org.codehaus.plexus:plexus-component-annotations:1.7.1")
-	
+
 	implementation("com.gradle:develocity-maven-extension:1.22")
 	implementation(project(":develocity-conventions-core"))
 
@@ -30,14 +29,3 @@ publishing {
 		}
 	}
 }
-
-compatibilityTest {
-	useJUnitPlatform()
-	dependency('Develocity Maven Extension') { develocityExtension ->
-		develocityExtension.groupId = 'com.gradle'
-		develocityExtension.artifactId = 'develocity-maven-extension'
-		develocityExtension.versions = [
-			'1.21.6'
-		]
-	}
-}