Update to Spock 2.0, Gradle 7.0.2, Maven 3.8.1

gradle/ide.gradle

@@ -1,20 +0,0 @@
-apply plugin: "idea"
-apply plugin: "eclipse"
-
-def gitIgnore = file(".gitignore").readLines()
-def gitIgnoreDirs = gitIgnore*.trim().findAll { !it.startsWith("#") && it.endsWith("/") }
-
-idea {
-  project {
-    jdkName "1.6"
-    configure(modules) {
-      excludeDirs = files(gitIgnoreDirs) as Set
-    }
-    ipr {
-      withXml { provider ->
-        def node = provider.asNode()
-        node.component.find { it.'@name' == 'VcsDirectoryMappings' }?.mapping[0].'@vcs' = 'Git'
-      }
-    }
-  }
-}

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,7 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionSha256Sum=3239b5ed86c3838a37d983ac100573f64c1f3fd8e1eb6c89fa5f9529b5ec091d
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.7.1-bin.zip
+# You can get the official checksums from https://gradle.org/release-checksums/
+distributionSha256Sum=0e46229820205440b48a5501122002842b82886e76af35f0f3a069243dca4b3c
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.0.2-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists