Merge remote-tracking branch 'upstream/1.21.8' into 1.21.8

Author: cev-api

src/main/java/net/wurstclient/WurstTranslator.java

@@ -237,10 +237,12 @@ private boolean isBuiltInWurstResourcePack(Resource resource)
 
 		if(!"fabric".equals(knownPack.namespace()))
 			return false;
-		
-		String id = knownPack.id();
-		return "wurst".equals(id) || "wurst_testmod".equals(id)
-			|| "nicewurst".equals(id);
+			
+		// Note: Namespace can be "fabric" or "vanilla" depending on
+		// Fabric API version (changed in 0.139.3+1.21.11).
+		return ("fabric".equals(knownPack.namespace())
+			|| "vanilla".equals(knownPack.namespace()))
+			&& "wurst".equals(knownPack.id()) || "nicewurst".equals(knownPack.id());
 	}
 
 }