Bump semver from 1.0.11 to 1.0.12

Bumps [semver](https://github.com/dtolnay/semver) from 1.0.11 to 1.0.12.
- [Release notes](https://github.com/dtolnay/semver/releases)
- [Commits](https://github.com/dtolnay/semver/compare/1.0.11...1.0.12)

---
updated-dependencies:
- dependency-name: semver
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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