use new conda-forge package pydap-server (#9741)

Author: kmuehlbauer

ci/requirements/environment.yml

@@ -36,14 +36,7 @@ dependencies:
   - pre-commit
   - pyarrow # pandas raises a deprecation warning without this, breaking doctests
   - pydap
-  # start pydap server dependencies, can be removed if pydap-server is available
-  - gunicorn
-  - PasteDeploy
-  - docopt-ng
-  - Webob
-  - Jinja2
-  - beautifulsoup4
-  # end pydap server dependencies
+  - pydap-server
   - pytest
   - pytest-cov
   - pytest-env