Raise minimum supported version of Gradle

Closes gh-41180

spring-boot-system-tests/spring-boot-image-tests/build.gradle

@@ -11,22 +11,6 @@ configurations {
 	providedRuntime {
 		extendsFrom dependencyManagement
 	}
-	all {
-		resolutionStrategy {
-			eachDependency { dependency ->
-				// Downgrade Jackson as Gradle cannot cope with 2.15.0's multi-version
-				// jar files with bytecode in META-INF/versions/19
-				if (dependency.requested.group.startsWith("com.fasterxml.jackson")) {
-					dependency.useVersion("2.14.2")
-				}
-				// Downgrade Spring Framework as Gradle cannot cope with 6.1.0-M1's
-				// multi-version jar files with bytecode in META-INF/versions/21
-				if (dependency.requested.group.equals("org.springframework")) {
-					dependency.useVersion("$springFramework60xVersion")
-				}
-			}
-		}
-	}
 }
 
 task syncMavenRepository(type: Sync) {