fix(deps): update dependency proj4 to v2.15.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
proj4 (source)	2.14.0 -> 2.15.0

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Release Notes

proj4js/proj4js (proj4)

### [`v2.15.0`](https://redirect.github.com/proj4js/proj4js/releases/tag/v2.15.0) [Compare Source](https://redirect.github.com/proj4js/proj4js/compare/v2.14.0...v2.15.0) #### What's Changed - Support more datum codes with smaller library size by [@​ahocevar](https://redirect.github.com/ahocevar) in [https://github.com/proj4js/proj4js/pull/486](https://redirect.github.com/proj4js/proj4js/pull/486) - Start UTM zone defs at 32601 and 32701 instead of 32600 and 32700 by [@​ahocevar](https://redirect.github.com/ahocevar) in [https://github.com/proj4js/proj4js/pull/487](https://redirect.github.com/proj4js/proj4js/pull/487) **Full Changelog**: https://github.com/proj4js/proj4js/compare/v2.14.0...v2.15.0

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