Bumps [github.com/miekg/dns](https://github.com/miekg/dns) from 1.1.38 to 1.1.40.
- [Release notes](https://github.com/miekg/dns/releases)
- [Changelog](https://github.com/miekg/dns/blob/master/Makefile.release)
- [Commits](https://github.com/miekg/dns/compare/v1.1.38...v1.1.40)
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