Prepare for release 2.3.1

Author: beamerblvd

CHANGELOG.rst

@@ -1,6 +1,10 @@
 Changelog
 =========
 
+2.3.1 (2023-10-28)
+------------------
+- [PATCH] Reverted to Checkstyle 9.3 due to 10.x's requiring Java 11
+
 2.3.0 (2023-10-27)
 ------------------
 - [MINOR] Bumped several plugin versions because it has been four years since the last update

README.rst

@@ -21,7 +21,7 @@ Java projects sponsored and hosted by OddSource Code must put the following at t
     <parent>
         <groupId>io.oddsource.java</groupId>
         <artifactId>oss-parent</artifactId>
-        <version>2.3.0</version>
+        <version>2.3.1</version>
     </parent>
 
 Simple projects under the OddSource umbrella should be able to releasing using the following steps::

pom.xml

@@ -25,7 +25,7 @@
     <packaging>pom</packaging>
 
     <name>OddSource OSS Parent</name>
-    <version>2.3.1-SNAPSHOT</version>
+    <version>2.3.1</version>
     <description>
         Parent POM for all OddSource Java Code projects.
     </description>