(Retroactively) bump version to 1.6

gradle.properties

@@ -6,11 +6,11 @@ supported_version=1.16.4/5
 
 archives_base_name=architectury
 archives_base_name_snapshot=architectury-snapshot
-base_version=1.5
+base_version=1.6
 maven_group=me.shedaniel
 
 fabric_loader_version=0.10.8
 fabric_api_version=0.29.3+1.16
 mod_menu_version=1.14.6+
 
-forge_version=35.1.36
+forge_version=35.1.36