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/0001-POM-Changes.patch

@@ -1,11 +1,11 @@
-From b729acf6c391a7f26a4e093724d238d56e6fa812 Mon Sep 17 00:00:00 2001
+From 4daeb84c011999face5942ce02193c4e0ba552c9 Mon Sep 17 00:00:00 2001
 From: Zach Brown <zach.brown@destroystokyo.com>
 Date: Mon, 29 Feb 2016 20:40:33 -0600
 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
 @@ -1,12 +1,12 @@
@@ -138,7 +138,7 @@ index f31825f52..6a0a02883 100644
                                  <relocation>
                                      <pattern>org.bukkit.craftbukkit</pattern>
                                      <shadedPattern>org.bukkit.craftbukkit.v${minecraft_version}</shadedPattern>
-@@ -247,18 +239,6 @@
+@@ -247,23 +239,11 @@
                  <groupId>org.apache.maven.plugins</groupId>
                  <artifactId>maven-compiler-plugin</artifactId>
                  <version>3.7.0</version>
@@ -157,6 +157,12 @@ index f31825f52..6a0a02883 100644
              </plugin>
              <plugin>
                  <groupId>org.apache.maven.plugins</groupId>
+                 <artifactId>maven-surefire-plugin</artifactId>
+-                <version>2.20.1</version>
++                <version>2.20</version> <!-- Paper - revert due to regression in some environments -->
+                 <configuration>
+                     <workingDirectory>${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
@@ -171,5 +177,5 @@ index 93046379d..674096cab 100644
  
          if (stream != null) {
 -- 
-2.14.1
+2.14.3