Bump curl from 0.4.46 to 0.4.47 (#276)

Bumps [curl](https://github.com/alexcrichton/curl-rust) from 0.4.46 to 0.4.47.
- [Release notes](https://github.com/alexcrichton/curl-rust/releases)
- [Commits](alexcrichton/curl-rust@curl-sys-0.4.46...curl-sys-0.4.47)

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

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