Bump jdcal from 1.4 to 1.4.1

Bumps [jdcal](https://github.com/phn/jdcal) from 1.4 to 1.4.1.
- [Release notes](https://github.com/phn/jdcal/releases)
- [Changelog](https://github.com/phn/jdcal/blob/master/CHANGELOG.txt)
- [Commits](phn/jdcal@v1.4...v1.4.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

requirements.txt

@@ -93,7 +93,7 @@ python-memcached<=1.59
 # Contribs
 xmltodict<0.12.1
 inflection<=0.3.1
-jdcal==1.4
+jdcal==1.4.1
 mock<4.0.0
 python-dateutil==2.8.0
 pytz==2019.1