Refresh apt cache before installing OpENer build deps

The hosted runner's apt index pinned libcap-dev to 2.66-5ubuntu2.2,
but the noble-updates mirror only carries a newer revision now, so
the install aborted with a 404 and exit code 100 before OpENer could
build. Run `apt-get update` first so the index points at versions
the mirror actually has.

Author: claude

.github/workflows/ci.yml

@@ -18,7 +18,7 @@ jobs:
     - run: npm run test
       working-directory: node-drivers
 
-    - run: sudo apt-get install -y cmake binutils libcap-dev
+    - run: sudo apt-get update && sudo apt-get install -y cmake binutils libcap-dev
 
     - uses: actions/checkout@v4
       with: