Bumps [wagtail-cache](https://github.com/coderedcorp/wagtail-cache) from 0.5.1 to 0.5.2.
- [Release notes](https://github.com/coderedcorp/wagtail-cache/releases)
- [Commits](https://github.com/coderedcorp/wagtail-cache/compare/v0.5.1...v0.5.2

)

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