Update dirs requirement from 5.0 to 6.0 in /rust (#261)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

rust/Cargo.toml

@@ -16,7 +16,7 @@ log = { version = "0.4" }
 ureq = { version = "2.7", optional = true }
 tar = { version = "0.4", optional = true }
 flate2 = { version = "1.0", optional = true }
-dirs = { version = "5.0", optional = true }
+dirs = { version = "6.0", optional = true }
 
 [features]
 download-bridgestan-src = ["dep:ureq", "dep:tar", "dep:flate2", "dep:dirs"]