Update plugin

Set proper scopes for maven bits, and
mindor dependency updates.
diff --git a/pom.xml b/pom.xml
index 7a35ef2..970d655 100644
--- a/pom.xml
+++ b/pom.xml
@@ -70,7 +70,6 @@
   <properties>
     <mavenVersion>3.2.5</mavenVersion>
     <javaVersion>7</javaVersion>
-    <mavenFilteringVersion>3.1.1</mavenFilteringVersion>
     <sitePluginVersion>3.3</sitePluginVersion>
     <project.build.outputTimestamp>2020-04-07T21:04:00Z</project.build.outputTimestamp>
   </properties>
@@ -81,21 +80,25 @@
       <groupId>org.apache.maven</groupId>
       <artifactId>maven-core</artifactId>
       <version>${mavenVersion}</version>
+      <scope>provided</scope>
     </dependency>
     <dependency>
       <groupId>org.apache.maven</groupId>
       <artifactId>maven-model</artifactId>
       <version>${mavenVersion}</version>
+      <scope>provided</scope>
     </dependency>
     <dependency>
       <groupId>org.apache.maven</groupId>
       <artifactId>maven-plugin-api</artifactId>
       <version>${mavenVersion}</version>
+      <scope>provided</scope>
     </dependency>
     <dependency>
       <groupId>org.apache.maven</groupId>
       <artifactId>maven-artifact</artifactId>
       <version>${mavenVersion}</version>
+      <scope>provided</scope>
     </dependency>
 
     <dependency>
@@ -123,7 +126,7 @@
     <dependency>
       <groupId>org.apache.maven.shared</groupId>
       <artifactId>maven-filtering</artifactId>
-      <version>${mavenFilteringVersion}</version>
+      <version>3.2.0</version>
     </dependency>
 
     <!-- plexus -->
@@ -137,7 +140,7 @@
     <dependency>
       <groupId>commons-io</groupId>
       <artifactId>commons-io</artifactId>
-      <version>2.5</version>
+      <version>2.6</version>
     </dependency>
     <dependency>
       <groupId>org.apache.velocity</groupId>
@@ -149,13 +152,13 @@
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.13.1</version>
+      <version>4.13.2</version>
       <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>org.apache.maven.plugin-testing</groupId>
       <artifactId>maven-plugin-testing-harness</artifactId>
-      <version>3.1.0</version>
+      <version>3.3.0</version>
       <scope>test</scope>
     </dependency>
     <dependency>