Bumps [proj4](https://github.com/proj4js/proj4js) from 2.5.0 to 2.6.3.
- [Release notes](https://github.com/proj4js/proj4js/releases)
- [Changelog](https://github.com/proj4js/proj4js/blob/master/changelog.md)
- [Commits](https://github.com/proj4js/proj4js/compare/2.5.0...2.6.3)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

• Commit 3a10f07
• #71: Bump proj4 from 2.5.0 to 2.6.3
• Branch main

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