Move the version of the shade plug-in to the parent pom.xml

### What's done:

 * See #1478.

Author: 0x6675636b796f75676974687562

diktat-rules/pom.xml

@@ -188,7 +188,6 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-shade-plugin</artifactId>
-                <version>3.3.0</version>
                 <configuration>
                     <!-- Suppress the generation of `dependency-reduced-pom.xml`,
                          because it will also get installed under `~/.m2`,

pom.xml

@@ -278,6 +278,11 @@
                     <artifactId>maven-failsafe-plugin</artifactId>
                     <version>3.0.0-M7</version>
                 </plugin>
+                <plugin>
+                    <groupId>org.apache.maven.plugins</groupId>
+                    <artifactId>maven-shade-plugin</artifactId>
+                    <version>3.3.0</version>
+                </plugin>
                 <plugin>
                     <groupId>org.codehaus.mojo</groupId>
                     <artifactId>versions-maven-plugin</artifactId>