Update dependency org.apache.maven.plugins:maven-shade-plugin to v3.6.1

Author: renovate-bot

pom.xml

@@ -122,7 +122,7 @@
         <!-- Include the local private gapic library in the package -->
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-shade-plugin</artifactId>
-        <version>3.4.1</version>
+        <version>3.6.1</version>
         <executions>
           <execution>
             <phase>package</phase>