chore(release): bump version to 1.3.8.0

Update mod_version in gradle.properties from 1.3.7.3 to 1.3.8.0 to prepare
for the new release.

gradle.properties

@@ -29,7 +29,7 @@ mixin_extras_version=0.3.6
 mod_id=avaritia
 mod_name=Re-Avaritia-forged
 mod_license=MIT
-mod_version=1.3.7.3
+mod_version=1.3.8.0
 mod_group_id=committee.nova.mods
 mod_authors=cnlimiter, Asek3, MikhailTapio
 mod_description=Are you the type of modded Minecraft player that makes a beeline for the designated \"end game\" and then gives up on ever playing again once you get there? Do you wish there was a way to make the process take significantly longer? Do you love GregTech, but wish it weren't so short? Do you sit down on your chest full of Galgadorian Drills and wish there was a mod that didn't just hand things to you on a silver platter?\n\n \n\nThis might be the mod for you!