Gradle wrapper version 6.8.3.

Change-Id: I64e8452ec30651fc4a8e8de842fc12556f2c6641
diff --git a/blog/gradle/wrapper/gradle-wrapper.properties b/blog/gradle/wrapper/gradle-wrapper.properties
index bb8b2fc..442d913 100644
--- a/blog/gradle/wrapper/gradle-wrapper.properties
+++ b/blog/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.5.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.8.3-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists