Write API version to pom.properties for Versioning to read

Maven writes this metadata normally, but we don't use maven. Maybe should modify Versioning instead in the future, but this works just fine for now.

patches/api/0006-Adventure.patch

@@ -7,10 +7,10 @@ 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 95327c3971cd57e01da2a62e1b72ba15fcbb63f4..4c197e7d9966f8789e6709461e59fc89355afd9c 100644
+index 218e9c682e7b91dc27f2caf46316ba7a7982e5f3..50c3a01826f0ff939e3ee935d5a4e446f46c8cce 100644
 --- a/build.gradle.kts
 +++ b/build.gradle.kts
-@@ -17,6 +17,11 @@ dependencies {
+@@ -19,6 +19,11 @@ dependencies {
      api("org.yaml:snakeyaml:1.29")
      api("com.googlecode.json-simple:json-simple:1.1.1") // Paper
      api("it.unimi.dsi:fastutil:8.2.2")