Update r2r requirement from 0.7.5 to 0.8.0 (#11)

Updates the requirements on [r2r](https://github.com/sequenceplanner/r2r) to permit the latest version.
- [Commits](https://github.com/sequenceplanner/r2r/compare/0.7.5...0.8.0)

---
updated-dependencies:
- dependency-name: r2r
  dependency-type: direct:production
...

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

Cargo.toml

@@ -19,7 +19,7 @@ num-traits = "0.2.15"
 fallible-iterator = "0.3.0"
 rosrust_msg = { version = "0.1", optional = true }
 rosrust = { version = "0.9.11", optional = true }
-r2r = { version = "0.7.5", optional = true }
+r2r = { version = "0.8.0", optional = true }
 
 [features]
 rosrust_msg = ["dep:rosrust_msg", "dep:rosrust"]