fix(build): revert maven-shade-plugin 3.3.0

Due to a bug in maven shade plugin 3.3.0, compile dependencies got stripped from `google-cloud-nio:shaded`. This bug only affects artifacts where shadedArtifactAttached=true.

Related: googleapis/java-bigtable-hbase#3600
Reference: https://issues.apache.org/jira/projects/MSHADE/issues/MSHADE-419

google-cloud-nio/pom.xml

@@ -104,7 +104,8 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-shade-plugin</artifactId>
-        <version>3.3.0</version>
+        <!-- MSHADE-419: 3.3.0 Shade plugin causes pom to be created without compile dependencies -->
+        <version>3.2.4</version>
         <configuration>
           <shadedArtifactAttached>true</shadedArtifactAttached>
           <relocations>

owlbot.py

@@ -21,4 +21,4 @@
     s.move(library)
 
 s.remove_staging_dirs()
-java.common_templates(excludes=["README.md", ".kokoro/build.sh"])
+java.common_templates(excludes=["README.md", ".kokoro/build.sh", "renovate.json"])

renovate.json

@@ -67,6 +67,12 @@
         "^com.fasterxml.jackson.core"
       ],
       "groupName": "jackson dependencies"
+    },
+    {
+      "packagePatterns": [
+        "^org.apache.maven.plugins:maven-shade-plugin"
+      ],
+      "allowedVersions": "(,3.3.0),(3.3.0,)"
     }
   ],
   "semanticCommits": true,