Bump @actions/artifact to 6.3.1

Regenerate upload and merge bundles and refresh dependency license metadata.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

package.json

@@ -33,7 +33,7 @@
     "node": ">=24"
   },
   "dependencies": {
-    "@actions/artifact": "^6.2.0",
+    "@actions/artifact": "^6.3.1",
     "@actions/core": "^3.0.0",
     "@actions/github": "^9.0.0",
     "@actions/glob": "^0.6.1",