Bump pytz from 2021.1 to 2023.3

Bumps pytz from 2021.1 to 2023.3.

Commits

0017b98 Bump version numbers to 2023.3 / 2023c
78dd05a Update README for 2023
cadd6a9 IANA 2023c
c402b01 Squashed 'tz/' changes from 71faa2a55..ed996bfdc
8c73ebd Bump version numbers to 2023.2 and 2023b
a341b6c Squashed 'tz/' changes from 4e604e411..6fdef0a54
80743c8 IANA 2023b
b837944 Bump version numbers to 2022.7.1 and 2022g
14d9199 Revert 8656870 to fix initialization thread safety
c412073 Fix Babel hyperlink in README
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UKHSA-Internal / coronavirus-dashboard-api-v1

Bump pytz from 2021.1 to 2023.3 #121