Add 7.4-rc-1 to versions to test

Author: deepy

src/test/groovy/com/github/gradle/RunWithMultipleGradleVersionsExtension.groovy

@@ -15,8 +15,10 @@ class RunWithMultipleGradleVersionsExtension extends AbstractAnnotationDrivenExt
     private static final GradleVersion MINIMUM_GRADLE_6_VERSION = GradleVersion.version("6.0")
     private static final GradleVersion CURRENT_GRADLE_VERSION = GradleVersion.current()
     private static final GradleVersion GRADLE_7_VERSION = GradleVersion.version("7.0")
+    private static final GradleVersion GRADLE_7RC_VERSION = GradleVersion.version("7.4-rc-1")
     private static final GradleVersion[] GRADLE_VERSIONS =
-            [MINIMUM_SUPPORTED_GRADLE_VERSION, MINIMUM_GRADLE_6_VERSION, CURRENT_GRADLE_VERSION, GRADLE_7_VERSION]
+            [MINIMUM_SUPPORTED_GRADLE_VERSION, MINIMUM_GRADLE_6_VERSION, CURRENT_GRADLE_VERSION, GRADLE_7_VERSION,
+             GRADLE_7RC_VERSION]
     private GradleVersion gradleVersion
 
     @Override