CI: fix mypy typing errors (pin numpy) on branch 1.4.x (pandas-dev#47967)

CI: fix mypy typing errors (pin numpy)

Author: simonjayhawkins

environment.yml

@@ -3,7 +3,7 @@ channels:
   - conda-forge
 dependencies:
   # required
-  - numpy>=1.18.5
+  - numpy>=1.18.5, <=1.22.4  # GH#47569
   - python=3.8
   - python-dateutil>=2.8.1
   - 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>=1.18.5
+numpy>=1.18.5, <=1.22.4
 python-dateutil>=2.8.1
 pytz
 asv