docs: sync the supported Maven version with the one stated in the system requirement section (#7570)

Author: nhumblot

maven/src/site/markdown/index.md.vm

@@ -1,7 +1,7 @@
 Usage
 ======================
 Dependency-check-maven is very simple to utilize and can be used as a stand-alone
-plug-in or as part of the site plug-in. The plug-in requires Maven 3.1 or higher.
+plug-in or as part of the site plug-in. The plug-in requires Maven 3.6.3 or higher.
 
 It is important to understand that the first time this task is executed it may
 take 20 minutes or more as it downloads and processes the data from the National

src/site/markdown/index.md

@@ -31,7 +31,7 @@ OWASP dependency-check's core analysis engine can be used as:
 - [Command Line Tool](dependency-check-cli/index.html)
 - [Gradle Plugin](dependency-check-gradle/index.html)
 - [Jenkins Plugin](dependency-check-jenkins/index.html)
-- [Maven Plugin](dependency-check-maven/index.html) - Maven 3.1 or newer required
+- [Maven Plugin](dependency-check-maven/index.html) - Maven 3.6.3 or newer required
 - [SBT Plugin](https://github.com/albuch/sbt-dependency-check)
 
 For help with dependency-check the following resource can be used: