build: publish as uk.potatolab:thaumicadditions, the name the pack resolves

Gitea's registry ignored case, so ThaumicAdditions and thaumicadditions were one package there; Nexus is
case-sensitive and the pack (modules.json) asks for thaumicadditions.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

settings.gradle

@@ -22,7 +22,7 @@ plugins {
 
 rootProject.name = 'thaumicadditions'
 
-// Published as uk.potatolab:ThaumicAdditions:<version>-<commit time>-g<sha>, to the organisation's registry.
+// Published as uk.potatolab:thaumicadditions:<version>-<commit time>-g<sha>, to the organisation's registry.
 stratum {
-    artifactId = 'ThaumicAdditions'
+    artifactId = 'thaumicadditions'
 }