downgrade snakeyaml to fix issues with comments

this was done by upstream, but got missed. Thanks @mrfloris for pointing this out.

patches/api/0003-Add-FastUtil-to-Bukkit.patch

@@ -6,12 +6,12 @@ Subject: [PATCH] Add FastUtil to Bukkit
 Doesn't expose to plugins, just allows Paper-API to use it for optimization
 
 diff --git a/build.gradle.kts b/build.gradle.kts
-index c54be6e9df689433a8aa280541cf9366609a3c27..9fe78a9570f7e8dd4c6f94fc3fb1bf176c1481d2 100644
+index b1a33fdfd6495e5243315312aca97c2512a64dcc..2feb94aeb1eef2241963f6b541247d923913e560 100644
 --- a/build.gradle.kts
 +++ b/build.gradle.kts
 @@ -18,6 +18,7 @@ dependencies {
      api("net.md-5:bungeecord-chat:1.16-R0.4")
-     api("org.yaml:snakeyaml:1.29")
+     api("org.yaml:snakeyaml:1.28")
      api("com.googlecode.json-simple:json-simple:1.1.1") // Paper
 +    api("it.unimi.dsi:fastutil:8.2.2")