Revert "deps: update dependency com.googlecode.maven-download-plugin:download-maven-plugin to v1.7.1" (#2271)

* Revert "deps: update dependency com.googlecode.maven-download-plugin:download-maven-plugin to v1.7.1 (#2151)"

Author: mpeddada1

gapic-generator-java/pom.xml

@@ -129,7 +129,7 @@
       <plugin>
         <groupId>com.googlecode.maven-download-plugin</groupId>
         <artifactId>download-maven-plugin</artifactId>
-        <version>1.7.1</version>
+        <version>1.6.8</version>
         <executions>
           <execution>
             <id>download-metadata-proto</id>

showcase/gapic-showcase/pom.xml

@@ -54,7 +54,7 @@
       <plugin>
         <groupId>com.googlecode.maven-download-plugin</groupId>
         <artifactId>download-maven-plugin</artifactId>
-        <version>1.7.1</version>
+        <version>1.6.8</version>
         <executions>
           <execution>
             <id>download-compliance-suite</id>
@@ -69,8 +69,6 @@
               <outputDirectory>src/test/resources</outputDirectory>
               <!-- Set this to always download the latest version and overwrite the existing file -->
               <overwrite>true</overwrite>
-              <!-- Don't use the local maven download plugin cache -->
-              <skipCache>true</skipCache>
             </configuration>
           </execution>
         </executions>