build(deps): update lru requirement from 0.10 to 0.12 (#2286)

Updates the requirements on [lru](https://github.com/jeromefroe/lru-rs) to permit the latest version.
- [Changelog](https://github.com/jeromefroe/lru-rs/blob/master/CHANGELOG.md)
- [Commits](jeromefroe/lru-rs@0.10.0...0.12.4)

---
updated-dependencies:
- dependency-name: lru
  dependency-type: direct:production
...

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Author: dependabot[bot]

quic/s2n-quic-qns/Cargo.toml

@@ -21,7 +21,7 @@ cfg-if = "1"
 futures = "0.3"
 http = "1.0"
 humansize = "2"
-lru = "0.10"
+lru = "0.12"
 rand = "0.8"
 s2n-codec = { path = "../../common/s2n-codec" }
 s2n-quic-core = { path = "../s2n-quic-core", features = ["testing"] }