Backport PR pandas-dev#42962: CI: Pin dateutil

Author: lithomas1

ci/deps/actions-38-numpydev.yaml

@@ -11,11 +11,11 @@ dependencies:
   - hypothesis>=3.58.0
 
   # pandas dependencies
+  - python-dateutil
   - pytz
   - pip
   - pip:
     - cython==0.29.21 # GH#34014
-    - "git+git://github.com/dateutil/dateutil.git"
     - "--extra-index-url https://pypi.anaconda.org/scipy-wheels-nightly/simple"
     - "--pre"
     - "numpy"