downgrade snakeyaml to fix issues with comments

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

patches/api/0006-Adventure.patch

@@ -7,11 +7,11 @@ Co-authored-by: zml <zml@stellardrift.ca>
 Co-authored-by: Jake Potrebic <jake.m.potrebic@gmail.com>
 
 diff --git a/build.gradle.kts b/build.gradle.kts
-index 9fe78a9570f7e8dd4c6f94fc3fb1bf176c1481d2..3a36b2b7f38e3446177f0883083d30c739f6c9b1 100644
+index 2feb94aeb1eef2241963f6b541247d923913e560..19b55f2c25db81fc352a7ab973b2ca7fefbcb432 100644
 --- a/build.gradle.kts
 +++ b/build.gradle.kts
 @@ -19,6 +19,11 @@ dependencies {
-     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")
 +    api(platform("net.kyori:adventure-bom:4.8.1"))