Update phf_codegen requirement from 0.10 to 0.11

Updates the requirements on [phf_codegen](https://github.com/sfackler/rust-phf) to permit the latest version.
- [Release notes](https://github.com/sfackler/rust-phf/releases)
- [Changelog](https://github.com/rust-phf/rust-phf/blob/master/CHANGELOG.md)
- [Commits](rust-phf/rust-phf@v0.10.0...v0.11.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

Cargo.toml

@@ -50,7 +50,7 @@ hex-literal = "0.3"
 pretty_assertions = "1.0"
 
 [build-dependencies]
-phf_codegen = "0.10"
+phf_codegen = "0.11"
 
 [badges]
 travis-ci = { repository = "rusticata/tls-parser" }