Update lib-parent from version 12 to 20

* Use the current versions of Maven plugins.
* Ensure that the POM is tidy.

Author: stefanbirkner

pom.xml

@@ -1,15 +1,15 @@
 <?xml version="1.0"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <parent>
         <groupId>com.github.stefanbirkner</groupId>
         <artifactId>lib-parent</artifactId>
-        <version>12</version>
+        <version>20</version>
     </parent>
 
     <artifactId>fake-sftp-server-lambda</artifactId>
-    <version>2.0.0</version>
+    <version>2.0.1-SNAPSHOT</version>
     <packaging>jar</packaging>
 
     <name>Fake SFTP Server Lambda</name>