Change to ParchmentMC mappings

build.gradle

@@ -3,6 +3,7 @@ plugins {
     id 'idea'
     id 'maven-publish'
     id 'net.minecraftforge.gradle' version '[6.0,6.2)'
+    id 'org.parchmentmc.librarian.forgegradle' version '1.+'
 }
 
 version = mod_version
@@ -30,7 +31,7 @@ minecraft {
     //
     // Use non-default mappings at your own risk. They may not always work.
     // Simply re-run your setup task after changing the mappings to update your workspace.
-    mappings channel: mapping_channel, version: mapping_version
+    mappings channel: "parchment", version: "2023.09.03-1.20.1"
 
     // When true, this property will have all Eclipse/IntelliJ IDEA run configurations run the "prepareX" task for the given run configuration before launching the game.
     // In most cases, it is not necessary to enable.

settings.gradle

@@ -5,6 +5,7 @@ pluginManagement {
             name = 'MinecraftForge'
             url = 'https://maven.minecraftforge.net/'
         }
+        maven { url = 'https://maven.parchmentmc.org' }
     }
 }