Update Gradle to 7.2

Closes gh-1944

buildSrc/src/main/groovy/io/spring/gradle/convention/TestsConfigurationPlugin.groovy

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License"); you may not
  * use this file except in compliance with the License. You may obtain a copy of
@@ -24,7 +24,7 @@ import org.gradle.jvm.tasks.Jar
  * Adds the ability to depends on the test jar within other projects using:
  *
  * <code>
- * testCompile project(path: ':foo', configuration: 'tests')
+ * testImplementation project(path: ':foo', configuration: 'tests')
  * </code>
  *
  * @author Rob Winch

buildSrc/src/test/resources/samples/integrationtest/withgroovy/build.gradle

@@ -13,6 +13,6 @@ dependencies {
 	testImplementation platform('org.junit:junit-bom:5.8.1')
 	testImplementation 'org.junit.jupiter:junit-jupiter-api'
 	testImplementation 'org.junit.jupiter:junit-jupiter-engine'
-	testCompile 'org.spockframework:spock-core:1.0-groovy-2.4'
+	testImplementation 'org.spockframework:spock-core:1.0-groovy-2.4'
 	integrationTestCompile 'org.springframework:spring-core:4.3.7.RELEASE'
 }

buildSrc/src/test/resources/samples/maven/install-with-springio/build.gradle

@@ -10,5 +10,5 @@ dependencies {
 	testImplementation platform('org.junit:junit-bom:5.8.1')
 	testImplementation 'org.junit.jupiter:junit-jupiter-api'
 	testImplementation 'org.junit.jupiter:junit-jupiter-engine'
-	compile 'org.springframework:spring-core'
-}
+	implementation  'org.springframework:spring-core'
+}