[JAVA-12744] Fix module to work with Gradle 7.x

gradle/gradle-fat-jar/README.md

@@ -0,0 +1,3 @@
+### Relevant Articles:
+
+- [Creating a Fat Jar in Gradle](https://www.baeldung.com/gradle-fat-jar)

gradle/gradle-fat-jar/build.gradle

@@ -1,9 +1,10 @@
 buildscript {
     repositories {
-        jcenter()
+        mavenCentral()
+        gradlePluginPortal()
     }
     dependencies {
-        classpath 'com.github.jengelman.gradle.plugins:shadow:4.0.3'
+        classpath "gradle.plugin.com.github.johnrengelman:shadow:7.1.2"
     }
 }