Bump reqwest from 0.11.5 to 0.11.6 in /src/agent (microsoft#1368)

Bumps [reqwest](https://github.com/seanmonstar/reqwest) from 0.11.5 to 0.11.6.
- [Release notes](https://github.com/seanmonstar/reqwest/releases)
- [Changelog](https://github.com/seanmonstar/reqwest/blob/master/CHANGELOG.md)
- [Commits](seanmonstar/reqwest@v0.11.5...v0.11.6)

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

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