Update Rust crate pyo3 to 0.21.2

cepitodb-master/Cargo.toml

@@ -6,7 +6,7 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-pyo3 = { version = "0.18.3", features = ["auto-initialize"] }
+pyo3 = { version = "0.21.2", features = ["auto-initialize"] }
 anyhow = { version = "1.0.83", features = ["backtrace"] }
 mysql = "23.0.1"
 serde = { version = "1.0.160", features = ["derive"] }