chore(deps): update ghcr.io/wekan/wekan docker tag to v7.51

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
ghcr.io/wekan/wekan	minor	v7.50 -> v7.51

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Release Notes

wekan/wekan (ghcr.io/wekan/wekan)

### [`v7.51`](https://togithub.com/wekan/wekan/blob/HEAD/CHANGELOG.md#v751-2024-06-27-WeKan--release) [Compare Source](https://togithub.com/wekan/wekan/compare/v7.50...v7.51) This release adds the following updates: - [Updated dependencies](https://togithub.com/wekan/wekan/pull/5452). Thanks to dependabot. - Moved docs from wiki to wekan repo docs directory, organized to subdirectories. Organizing and updating in progress. [Part 1](https://togithub.com/wekan/wekan/commit/1961e22cbd51e83aa131c8b092c7d43475a021eb), [Part 2](https://togithub.com/wekan/wekan/commit/ce89ff48331a27ffb42d021833c78df3a462b9db), [Part 3](https://togithub.com/wekan/wekan/commit/449c02c42a0183a49592ada89bdfb8f25e5db903), [Part 4](https://togithub.com/wekan/wekan/commit/0fb2f7fdd6b6cb828ab4ea534204a5b834d2e19a), [Part 5](https://togithub.com/wekan/wekan/commit/e9c1c620eb938349c30761497066daf41cdcfc19), [Part 6](https://togithub.com/wekan/wekan/commit/6b7b66801b716e1d0bf2548b18eed4ed4e354f2d), [Part 7](https://togithub.com/wekan/wekan/commit/1cfaddff9cd4fe84fb74c80d1585f2a5dd65f5ca), [Part 8](https://togithub.com/wekan/wekan/commit/057ac4031eaa912b849c637e163f4dffa79a9329), [Part 9](https://togithub.com/wekan/wekan/commit/52375df78380bbe3407b51dc986baaf6f31f40e4), [Part 10](https://togithub.com/wekan/wekan/commit/00a56f6aaa0c2bcd24ca8829a0718b45e7cedf04), [Part 11](https://togithub.com/wekan/wekan/commit/c863428aa2597457fc4931e7b1bdd75d6cc2610b). Thanks to xet7. and fixes the following bugs: - [Fix ModernDark Cards not showing correctly](https://togithub.com/wekan/wekan/pull/5455). Thanks to walster001. Thanks to above GitHub users for their contributions and translators for their translations.

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