Revert maven-surefire to prevent a build regression

In some environments, the 2.20.1 version of the maven surefire plugin
can cause builds to fail due to changes in surefire in how it detects
that the forked JVM used for testing is still alive or not.

Spigot-Server-Patches/POM-Changes.patch

@@ -5,7 +5,7 @@ Subject: [PATCH] POM Changes
 
 
 diff --git a/pom.xml b/pom.xml
-index f31825f52..6a0a02883 100644
+index c73b4b4f5..0c4398228 100644
 --- a/pom.xml
 +++ b/pom.xml
 @@ -0,0 +0,0 @@
@@ -157,6 +157,12 @@ index f31825f52..6a0a02883 100644
              </plugin>
              <plugin>
                  <groupId>org.apache.maven.plugins</groupId>
+                 <artifactId>maven-surefire-plugin</artifactId>
+-                <version>2.20.1</version>
++                <version>2.20</version> <!-- Paper - revert due to regression in some environments -->
+                 <configuration>
+                     <workingDirectory>${basedir}/target/test-server</workingDirectory>
+                     <excludes>
 diff --git a/src/main/java/org/bukkit/craftbukkit/util/Versioning.java b/src/main/java/org/bukkit/craftbukkit/util/Versioning.java
 index 93046379d..674096cab 100644
 --- a/src/main/java/org/bukkit/craftbukkit/util/Versioning.java