ci: fix RPM artifact download in release job

PR #1917 split the RPM build into a Fedora 43/44 matrix that now
uploads two artifacts (lemonade-rpm-fedora-43, lemonade-rpm-fedora-44),
but the release job's download step still referenced the old
single-artifact name `lemonade-rpm`, causing the v10.5.1 release to fail.

Switch to a pattern-based download with merge-multiple so both Fedora
RPMs land in the working directory for the downstream glob to pick up.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: jeremyfowers

.github/workflows/cpp_server_build_test_release.yml

@@ -1834,11 +1834,12 @@ jobs:
           name: Lemonade_Server_MSI_Signed
           path: .
 
-      - name: Download Lemonade .rpm Package
+      - name: Download Lemonade .rpm Packages
         uses: actions/download-artifact@v7
         with:
-          name: lemonade-rpm
+          pattern: lemonade-rpm-fedora-*
           path: .
+          merge-multiple: true
 
       - name: Download Lemonade macOS .pkg Package
         uses: actions/download-artifact@v7