Use tiqi zedboard deploy key for tiqi-rpc too

Author: Martin Stadler

.github/workflows/gh-pages.yml

@@ -29,7 +29,6 @@ jobs:
       - uses: webfactory/ssh-agent@v0.9.0
         with:
           ssh-private-key: |
-            ${{ secrets.GITLAB_TIQI_RPC_SSH_KEY }}
             ${{ secrets.GITLAB_TIQI_ZEDBOARD_SSH_KEY }}
 
       - name: Configure SSH for GitLab