Update gradle to version 6.7
Use the Java Library plugin and switch to the new (non-deprecated)
syntax for declaring dependencies.
Various other cleanups/modernizations in build.gradle.
Change-Id: Iac6734562eeda68c588a93775596f1e598eafd1f
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 1b16c34..be52383 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.1.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.7-bin.zip
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists