Bump pytz from 2023.3.post1 to 2024.1 in /backend

[dependabot[bot]]

Bumps pytz from 2023.3.post1 to 2024.1.

Commits

• fb43f95 Github releases
• 3680953 Bump version numbers to 2024.1 / 2024a
• 8cde178 IANA 2024a
• e22640e Squashed 'tz/' changes from cc48c2dfa..beeb53a3d
• ebee1ae Stop building unused distribution files
• 77d9c8c Default to Python 3.12
• 8f15f80 PyPI publication from github
• ee2e37b Bump version to 2023.4 (2023d)
• 4a37f7c Squashed 'tz/' changes from ddb8cf09d..2bb5bb955
• 4a8ca23 IANA 2023d
• See full diff in compare view

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