Updated dependency - dnspython is a required dependency of pymongo as…

… of pymongo v4.3 (https://pymongo.readthedocs.io/en/stable/changelog.html#changes-in-version-4-3-4-3-2)

apiserver/requirements.txt

@@ -25,7 +25,7 @@ packaging==20.3
 psutil>=5.6.5
 pyhocon>=0.3.35r
 pyjwt>=2.4.0
-pymongo[srv]==4.4.0
+pymongo==4.4.0
 python-rapidjson>=0.6.3
 redis>=4.5.4,<5
 requests>=2.13.0