tests: update mock-ssh-server (#3986)

Author: skshetry

scripts/ci/install.sh

@@ -10,8 +10,6 @@ scriptdir="$(dirname $0)"
 # work or not.
 $scriptdir/retry.sh pip install .[all,tests]
 
-$scriptdir/retry.sh pip install git+https://github.com/iterative/mock-ssh-server.git
-
 git config --global user.email "[email protected]"
 git config --global user.name "DVC Tester"
 

setup.py

@@ -121,7 +121,7 @@ def run(self):
     "flake8-docstrings",
     "pydocstyle<4.0",
     "jaraco.windows==3.9.2",
-    "mock-ssh-server",
+    "mock-ssh-server>=0.8.2",
     "moto==1.3.14.dev464",
     "rangehttpserver==1.2.0",
     "beautifulsoup4==4.4.0",