build: set maven-enforcer-plugin to 3.5.0 for offline mirror compatibility (#399)

Change-Id: I3f5adcb7864d39e2f3c2bc5de148936f6e0e248c

Co-authored-by: Anshul Patni <anshulpatni@google.com>

Author: AnshulPatni

function-maven-plugin/pom.xml

@@ -105,7 +105,7 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-enforcer-plugin</artifactId>
-          <version>3.6.3</version>
+          <version>3.5.0</version>
         </plugin>
       </plugins>
     </pluginManagement>
@@ -133,7 +133,7 @@
           <plugin>
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-enforcer-plugin</artifactId>
-            <version>3.6.3</version>
+            <version>3.5.0</version>
           </plugin>
           <plugin>
             <groupId>org.apache.maven.plugins</groupId>

functions-framework-api/pom.xml

@@ -123,7 +123,7 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-enforcer-plugin</artifactId>
-          <version>3.6.3</version>
+          <version>3.5.0</version>
         </plugin>
         <plugin>
           <artifactId>maven-javadoc-plugin</artifactId>
@@ -162,7 +162,7 @@
           <plugin>
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-enforcer-plugin</artifactId>
-            <version>3.6.3</version>
+            <version>3.5.0</version>
           </plugin>
           <plugin>
             <groupId>org.apache.maven.plugins</groupId>

invoker/pom.xml

@@ -88,7 +88,7 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-enforcer-plugin</artifactId>
-          <version>3.6.3</version>
+          <version>3.5.0</version>
         </plugin>
       </plugins>
     </pluginManagement>
@@ -101,7 +101,7 @@
           <plugin>
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-enforcer-plugin</artifactId>
-            <version>3.6.3</version>
+            <version>3.5.0</version>
           </plugin>
           <plugin>
             <groupId>org.apache.maven.plugins</groupId>