Move cb version definition to gradle patch

patches/server/0001-Setup-Gradle-project.patch

@@ -28,10 +28,10 @@ index 37dab9e868dbfb019c271a547d975a48ad1cb571..3811c0d849a3eb028ed1a6b7a2d4747f
 +/.factorypath
 diff --git a/build.gradle.kts b/build.gradle.kts
 new file mode 100644
-index 0000000000000000000000000000000000000000..a41b15de7eba00d62822f582015d324ccde7dfe7
+index 0000000000000000000000000000000000000000..0aa34e8bb81700a3660ba89b3e2a8f53f10ca34c
 --- /dev/null
 +++ b/build.gradle.kts
-@@ -0,0 +1,119 @@
+@@ -0,0 +1,122 @@
 +import io.papermc.paperweight.util.*
 +
 +plugins {
@@ -60,7 +60,10 @@ index 0000000000000000000000000000000000000000..a41b15de7eba00d62822f582015d324c
 +    testImplementation("org.ow2.asm:asm-tree:9.7")
 +}
 +
-+val craftbukkitPackageVersion = "1_20_R4" // Paper
++paperweight {
++    craftBukkitPackageVersion.set("v1_20_R4") // also needs to be updated in MappingEnvironment
++}
++
 +tasks.jar {
 +    archiveClassifier.set("dev")
 +