chore: Only upload merged jar

Author: TonimatasDEV

.github/workflows/build.yml

@@ -38,4 +38,4 @@ jobs:
         uses: actions/upload-artifact@v4
         with:
           name: PacketFixer21
-          path: packetfixer/java21/build/libs/**.jar
+          path: packetfixer/java21/build/libs/**merged.jar