Update shadow-rs requirement from 0.20.0 to 0.21.0

Updates the requirements on [shadow-rs](https://github.com/baoyachi/shadow-rs) to permit the latest version.
- [Release notes](https://github.com/baoyachi/shadow-rs/releases)
- [Changelog](https://github.com/baoyachi/shadow-rs/blob/master/CHANGELOG.md)
- [Commits](baoyachi/shadow-rs@v0.20.0...v0.21.0)

---
updated-dependencies:
- dependency-name: shadow-rs
  dependency-type: direct:production
...

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

Cargo.toml

@@ -53,14 +53,14 @@ rstats = "1.2.39"
 thiserror = "1.0"
 parquet = "33.0.0"
 arrow = "33.0.0"
-shadow-rs = "0.20.0"
+shadow-rs = "0.21.0"
 serde_yaml = "0.9.17"
 whoami = "1.3.0"
 either = {version = "1.8.1", features = ["serde"]}
 num = "0.4.0"
 
 [build-dependencies]
-shadow-rs = "0.20.0"
+shadow-rs = "0.21.0"
 
 [features]
 default = []