Update dependency net.fabricmc:fabric-loader to v0.19.0

Author: renovate[bot]

gradle.properties

@@ -4,7 +4,7 @@ org.gradle.jvmargs=-Xmx4G
 # check these on https://fabricmc.net/develop/
 minecraft_version=1.21.4
 yarn_mappings=1.21.4+build.2
-loader_version=0.18.4
+loader_version=0.19.0
 fabric_version=0.112.2+1.21.4
 
 velocity_version=3.3.0-SNAPSHOT