refactor(ALL): bump minecraft version to 1.21.5

trimmed unused feature: /gamerule CustomEntity API, Custom Item API

We'll use Polymer for replacement in the future.
Tests needed.

build.gradle

@@ -2,7 +2,7 @@ plugins {
     id 'maven-publish'
     id("io.freefair.lombok") version "8.6"
     id("com.github.johnrengelman.shadow") version "8.1.1"
-    id 'fabric-loom' version '1.7.3'
+    id 'fabric-loom' version '1.10.1'
 }
 
 version = project.mod_version
@@ -18,7 +18,6 @@ repositories {
     // Loom adds the essential maven repositories to download Minecraft and libraries from automatically.
     // See https://docs.gradle.org/current/userguide/declaring_repositories.html
     // for more information about repositories.
-    maven { url 'https://maven.wispforest.io/releases/' }
 }
 
 dependencies {