Bump url from 2.2.1 to 2.2.2 in /cmd/pinniped-proxy (#2777)

Bumps [url](https://github.com/servo/rust-url) from 2.2.1 to 2.2.2.
- [Release notes](https://github.com/servo/rust-url/releases)
- [Commits](servo/rust-url@v2.2.1...v2.2.2)

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