Update pandas to 1.3.5 (#654)

* Update pandas from 1.3.4 to 1.3.5

Author: pyup-bot

extra_requirements.txt

@@ -14,7 +14,7 @@ scandir>=1.8
 # pyfakefs to work with pandas
 # we use the latest version to see any problems with new versions
 pandas==1.1.5; python_version <= '3.6'
-pandas==1.3.4; python_version > '3.6'
+pandas==1.3.5; python_version > '3.6'
 xlrd==1.2.0; python_version <= '3.6'
 xlrd==2.0.1; python_version > '3.6'
 openpyxl==3.0.9