Update rstats requirement from 1.2.50 to 2.0.1

Updates the requirements on [rstats](https://github.com/liborty/rstats) to permit the latest version.
- [Commits](https://github.com/liborty/rstats/commits)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Cargo.toml

@@ -60,7 +60,7 @@ pyo3 = { version = "0.19.0", optional = true, features = ["extension-module"] }
 pyo3-log = { version = "0.8.2", optional = true }
 numpy = { version = "0.19", optional = true }
 indicatif = { version = "0.17", features = ["rayon"] }
-rstats = "1.2.50"
+rstats = "2.0.1"
 thiserror = "1.0"
 parquet = { version = "47.0.0", default-features = false, features = [
     "arrow",