HBASE-27992 Bump exec-maven-plugin to 3.1.0 (#5334)

Signed-off-by: Duo Zhang <zhangduo@apache.org>

Author: petersomogyi

hbase-shaded/hbase-shaded-check-invariants/pom.xml

@@ -170,7 +170,7 @@
       <plugin>
         <groupId>org.codehaus.mojo</groupId>
         <artifactId>exec-maven-plugin</artifactId>
-        <version>1.6.0</version>
+        <version>${exec.maven.version}</version>
         <executions>
           <!-- It's easier to have two copies of our validation
                script than to copy it via remote-resources-plugin, but

hbase-shaded/hbase-shaded-with-hadoop-check-invariants/pom.xml

@@ -161,7 +161,7 @@
       <plugin>
         <groupId>org.codehaus.mojo</groupId>
         <artifactId>exec-maven-plugin</artifactId>
-        <version>1.6.0</version>
+        <version>${exec.maven.version}</version>
         <executions>
           <!-- It's easier to have two copies of our validation
                script than to copy it via remote-resources-plugin, but

pom.xml

@@ -864,7 +864,7 @@
       When updating checkstyle.version, please make the same change in `.idea/checkstyle-idea.xml`
     -->
     <checkstyle.version>8.29</checkstyle.version>
-    <exec.maven.version>1.6.0</exec.maven.version>
+    <exec.maven.version>3.1.0</exec.maven.version>
     <error-prone.version>2.16</error-prone.version>
     <jamon.plugin.version>2.4.2</jamon.plugin.version>
     <lifecycle.mapping.version>1.0.0</lifecycle.mapping.version>