Update aenum requirement from ~=3.1.11 to ~=3.1.15

[dependabot[bot]]

Updates the requirements on aenum to permit the latest version.

Commits

• 2d72c2f version 3.1.15
• c59bfd7 repair packaging
• ab7797a bump version
• 7a0d4f5 version 3.1.14
• d4e9be7 remove SqliteEnum from all when not present
• 0217625 bump version
• 0b4edca version 3.1.13
• 2f79e9c update documentation
• 61ae6aa Enum & Flag inherit directly from stdlib versions
• 5ae55a2 remove 2.6 support; add 3.12 enhancements
• Additional commits viewable in compare view

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[dependabot[bot]]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.