Update hifitime requirement from 3.9 to 4.0

Updates the requirements on [hifitime](https://github.com/nyx-space/hifitime) to permit the latest version.
- [Release notes](https://github.com/nyx-space/hifitime/releases)
- [Commits](nyx-space/hifitime@3.9.0...4.0.0)

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

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

Cargo.toml

@@ -22,7 +22,7 @@ all-features = true
 rustdoc-args = ["--cfg", "docsrs"]
 
 [dependencies]
-hifitime = { version = "3.9", optional = true }
+hifitime = { version = "4.0", optional = true }
 once_cell = { version = "1.19", optional = true }
 regex = { version = "1.7", optional = true }
 reqwest = { version = "0.12", optional = true }