chore(rust): Bump tokio from 1.49.0 to 1.50.0 in /rust (apache#4038)

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Author: dependabot[bot]

rust/Cargo.lock

@@ -38,7 +38,7 @@ arrow-buffer = "57.3.0"
 arrow-schema = "57.3.0"
 datafusion = { version = "52.1.0", default-features = false }
 datafusion-substrait = { version = "52.1.0", default-features = false }
-tokio = { version = "1.49", features = ["rt-multi-thread"] }
+tokio = { version = "1.50", features = ["rt-multi-thread"] }
 prost = "0.14.3"
 
 [dev-dependencies]