Bump pytz from 2020.4 to 2021.1 (#247)

Bumps [pytz](https://github.com/stub42/pytz) from 2020.4 to 2021.1.
- [Release notes](https://github.com/stub42/pytz/releases)
- [Commits](stub42/pytz@release_2020.4...release_2021.1)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements.txt

@@ -1,5 +1,5 @@
 Click==7.1.2
-pytz==2020.4
+pytz==2021.1
 PyYAML==5.4.1
 requests==2.25.1
 requests-hawk==1.1.0