Remove use of oss-parent

This is boilerplate that came from setting up the project and has
been deprecated for several years.

README.md

@@ -45,7 +45,6 @@ Please refer to the appropriate README.md file:
 ## TODO
 
 - Migrate from maven-deploy-plugin to nexus-staging-maven-plugin, see: https://central.sonatype.org/publish/publish-maven/#nexus-staging-maven-plugin-for-deployment-and-release
-- Stop using oss-parent, see: https://central.sonatype.org/publish/publish-maven/#create-a-ticket-with-sonatype
 
 ## Notes
 This project was initially created according to the [Maven Getting Started Guide](https://maven.apache.org/guides/getting-started/):

pom.xml

@@ -18,14 +18,6 @@
     </license>
   </licenses>
 
-  <!-- brings the sonatype snapshot repository and signing requirement on board -->
-  <parent>
-    <groupId>org.sonatype.oss</groupId>
-    <artifactId>oss-parent</artifactId>
-    <version>9</version>
-    <relativePath />
-  </parent>
-
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <maven.compiler.release>11</maven.compiler.release>