Bump github.com/mholt/certmagic from f92e853 to e3e89d1

Bumps [github.com/mholt/certmagic](https://github.com/mholt/certmagic) from `f92e853` to `e3e89d1`.
- [Release notes](https://github.com/mholt/certmagic/releases)
- [Commits](caddyserver/certmagic@f92e853...e3e89d1)

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