Updated Upstream (Bukkit/CraftBukkit/Spigot)

Upstream has released updates that appear 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:
4b08dbc5 PR-752: Make Leaves Waterlogged
de323fc9 Downgrade dependency version

CraftBukkit Changes:
c3f219edb Fix missing abstract in CraftLeaves
886e6d8c8 SPIGOT-7038: Setting title or subtitle to empty string causes the player to disconnect
6c302a5e3 Make Leaves Waterlogged
53b681be5 Downgrade dependency version

Spigot Changes:
ee737122 Fixed system messages shown in action bar
f343df82 SPIGOT-7036: Don't use CHAT message type
63a06049 SPIGOT-7035: Actionbar Sending in Main Chat

patches/api/0370-Add-missing-block-data-mins-and-maxes.patch

@@ -41,10 +41,10 @@ index d4d08bd424f84523200d1a2012f4d37c07cc3497..7baccce27f2db2242f628ea92a9d0402
 +    // Paper end
  }
 diff --git a/src/main/java/org/bukkit/block/data/type/Leaves.java b/src/main/java/org/bukkit/block/data/type/Leaves.java
-index 3874d5d9647107c409651d20470a57197b4f3a3d..1050f5d9d2e75d221ce26eca0ef14add07221f19 100644
+index 3ea21dfad26222ee70fbc627595f54de1a28aa96..cd013a7c42648d819d1e91c7cf9f97a8190c1fad 100644
 --- a/src/main/java/org/bukkit/block/data/type/Leaves.java
 +++ b/src/main/java/org/bukkit/block/data/type/Leaves.java
-@@ -39,4 +39,20 @@ public interface Leaves extends BlockData {
+@@ -39,4 +39,20 @@ public interface Leaves extends Waterlogged {
       * @param distance the new 'distance' value
       */
      void setDistance(int distance);