fix pip for upstream-dev (#4640)

mathause · web-flow · commit 7152b41fa80a · 2020-12-02T08:52:29.000-08:00
diff --git a/ci/requirements/py38.yml b/ci/requirements/py38.yml
@@ -29,7 +29,7 @@ dependencies:
   - numpy
   - pandas
   - pint
-  - pip
+  - pip=20.2
   - pseudonetcdf
   - pydap
   # - pynio: not compatible with netCDF4>1.5.3; only tested in py36-bare-minimum
