TMP: pin openssl for doc build (#28404)

Author: jorisvandenbossche

environment.yml

@@ -82,3 +82,7 @@ dependencies:
   - xlwt  # pandas.read_excel, DataFrame.to_excel, pandas.ExcelWriter, pandas.ExcelFile
   - odfpy  # pandas.read_excel
   - pyreadstat  # pandas.read_spss
+
+  # temporarily pin openssl
+  # https://github.com/pandas-dev/pandas/issues/28402
+  - openssl=1.1.1c

scripts/generate_pip_deps_from_conda.py

@@ -19,7 +19,7 @@
 
 import yaml
 
-EXCLUDE = {"python=3"}
+EXCLUDE = {"python=3", "openssl=1.1.1c"}
 RENAME = {"pytables": "tables", "pyqt": "pyqt5"}