fix(deps): update dependency preact-render-to-string to v5.1.15

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
preact-render-to-string	5.1.14 -> 5.1.15

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Release Notes

developit/preact-render-to-string

### [`v5.1.15`](https://togithub.com/developit/preact-render-to-string/releases/v5.1.15) [Compare Source](https://togithub.com/developit/preact-render-to-string/compare/v5.1.14...v5.1.15) - Performance: Memoize entity encoding ([#​184](https://togithub.com/developit/preact-render-to-string/issues/184), thanks [@​marvinhagemeister](https://togithub.com/marvinhagemeister)) #### Maintenance - Add some simple Benchmarks ([#​169](https://togithub.com/developit/preact-render-to-string/issues/169), thanks [@​marvinhagemeister](https://togithub.com/marvinhagemeister))

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