rust: bump cargo version (#1329)

### Changelog
- Added: Added options to disable CRC calculations in the rust writer
- Changed: reduce allocations while writing messages
### Docs

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### Description

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<table><tr><th>Before</th><th>After</th></tr><tr><td>

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rust/Cargo.toml

@@ -7,7 +7,7 @@ categories = [ "science::robotics", "compression" ]
 repository = "https://github.com/foxglove/mcap"
 documentation = "https://docs.rs/mcap"
 readme = "README.md"
-version = "0.14.1"
+version = "0.15.0"
 edition = "2021"
 license = "MIT"