Update coverage.yml

Author: wangzelin007

.github/workflows/coverage.yml

@@ -101,7 +101,7 @@ jobs:
       run: |
         set -ev
         source ./env/bin/activate
-        pip install distro xmltodict~=0.12 websocket-client~=1.3.1
+        pip install distro xmltodict~=0.12 websocket-client~=1.3.1 sshtunnel~=0.1.4
         az --version
         pip install setuptools==70.0.0 wheel==0.30.0
         azdev extension add "*"