fix: match releasebranch artifact name with filename (guacsec#313)

Author: Strum355

.github/workflows/release.yml

@@ -66,7 +66,7 @@ jobs:
 
       - uses: actions/upload-artifact@v5
         with:
-          name: releasebranch
+          name: releasebranch.txt
           path: releasebranch.txt
 
       - name: Create GitHub release tag