Bump pytz from 2020.5 to 2022.7

[dependabot[bot]]

Bumps pytz from 2020.5 to 2022.7.

Commits

• 309a457 Update i18n section of README
• 67b32d0 Separete legacy tests to run in legacy container
• ce19dbe Bump version numbers to 2022.7/2022g
• 7285e70 IANA 2022g
• 3a52798 Squashed 'tz/' changes from d3dc2a9d6..9baf0d34d
• 8656870 Let _all_timezones_unchecked be garbage collected when no longer needed
• bd3e51f Rename all_timezones_unchecked to strongly indicate it is not public
• 01592a9 Merge pull request #90 from eendebakpt/import_time_lazy_list
• 5e9f112 lazy timezone
• 4ebc28d Bump version numbers to 2022.6 / 2022f
• Additional commits viewable in compare view

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