Updated Upstream (Bukkit/CraftBukkit/Spigot)

Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing

Bukkit Changes:
79f6ba25 Skip tests on default builds
b85cc32f Further discourage World.regenerateChunk

CraftBukkit Changes:
7560d3b5 Skip tests on default builds
d0a9130d SPIGOT-4563: Fix regenerating chunks saved to disk already

Spigot Changes:
8173d06f Remove need for redundant second clone of repositories
8ede0393 Rebuild patches

Spigot-API-Patches/Allow-plugins-to-use-SLF4J-for-logging.patch

@@ -14,7 +14,7 @@ it without having to shade it in the plugin and going through
 several layers of logging abstraction.
 
 diff --git a/pom.xml b/pom.xml
-index 7ca5363b3..5fd948719 100644
+index 041ae474..3e2c1cd5 100644
 --- a/pom.xml
 +++ b/pom.xml
 @@ -0,0 +0,0 @@
@@ -33,7 +33,7 @@ index 7ca5363b3..5fd948719 100644
          <dependency>
              <groupId>junit</groupId>
 diff --git a/src/main/java/org/bukkit/plugin/Plugin.java b/src/main/java/org/bukkit/plugin/Plugin.java
-index 55debf5d5..8d2999ace 100644
+index 55debf5d..8d2999ac 100644
 --- a/src/main/java/org/bukkit/plugin/Plugin.java
 +++ b/src/main/java/org/bukkit/plugin/Plugin.java
 @@ -0,0 +0,0 @@ public interface Plugin extends TabExecutor {