chore(deps): update ghcr.io/wekan/wekan docker tag to v7.50

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
ghcr.io/wekan/wekan	minor	v7.49 -> v7.50

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Release Notes

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

### [`v7.50`](https://togithub.com/wekan/wekan/blob/HEAD/CHANGELOG.md#v750-2024-06-22-WeKan--release) [Compare Source](https://togithub.com/wekan/wekan/compare/v7.49...v7.50) This release adds the following new features: - [Added "Clean dark" and "Clean light" themes that are more clean and modern looking](https://togithub.com/wekan/wekan/pull/5449). Thanks to abramchikd. and adds the following updates: - Updated docs for WeKan version for Windows. [Part 1](https://togithub.com/wekan/wekan/commit/9b428150a4fb9efdcb2ae9d3bb59d0da29529e69), [Part 2](https://togithub.com/wekan/wekan/commit/3c35a6400b88e071a474a552ee941892522c8d59). Thanks to xet7. - Updated dependencies. [Part 1](https://togithub.com/wekan/wekan/pull/5446), [Part 2](https://togithub.com/wekan/wekan/commit/99a8afd6c39591e0d85fe5f55ebc3016b9e7f011). Thanks to developers of dependencies. and fixes the following bugs: - [Task card may overflow below the screen when maximized, making the bottom part not viewable](https://togithub.com/wekan/wekan/pull/5443). Thanks to Hekatomb. Thanks to above GitHub users for their contributions and translators for their translations.

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