Backport PR pandas-dev#39526: CI: pin numpy for CI / Checks github action (pandas-dev#39529)

Co-authored-by: Simon Hawkins <[email protected]>

Author: meeseeksmachine

environment.yml

@@ -3,7 +3,7 @@ channels:
   - conda-forge
 dependencies:
   # required
-  - numpy>=1.16.5
+  - numpy>=1.16.5, <1.20 # gh-39513
   - python=3
   - python-dateutil>=2.7.3
   - pytz

requirements-dev.txt

@@ -1,7 +1,7 @@
 # This file is auto-generated from environment.yml, do not modify.
 # See that file for comments about the need/usage of each dependency.
 
-numpy>=1.16.5
+numpy>=1.16.5, <1.20
 python-dateutil>=2.7.3
 pytz
 asv