Update rlimit requirement from 0.7.0 to 0.8.0

Updates the requirements on [rlimit](https://github.com/Nugine/rlimit) to permit the latest version.
- [Release notes](https://github.com/Nugine/rlimit/releases)
- [Changelog](https://github.com/Nugine/rlimit/blob/master/CHANGELOG.md)
- [Commits](Nugine/rlimit@v0.7.0...v0.8.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

server-common/Cargo.toml

@@ -19,7 +19,7 @@ trillium-http = { path = "../http", version = "^0.2.0" }
 trillium-tls-common = { path = "../tls-common/", version = "^0.1.0" }
 
 [target.'cfg(unix)'.dependencies]
-rlimit = "0.7.0"
+rlimit = "0.8.0"
 
 [dev-dependencies]
 trillium-smol = { path = "../smol" }