Bump sqlite-utils from 2.5 to 2.6

Bumps [sqlite-utils](https://github.com/simonw/sqlite-utils) from 2.5 to 2.6.
- [Release notes](https://github.com/simonw/sqlite-utils/releases)
- [Changelog](https://github.com/simonw/sqlite-utils/blob/master/docs/changelog.rst)
- [Commits](simonw/sqlite-utils@2.5...2.6)

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