update dfr to polars 0.30.0 (#9424)

# Description

Update the polars dependency for dataframes to stay on-version.

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crates/nu-cmd-dataframe/Cargo.toml

@@ -59,7 +59,7 @@ features = [
 	"to_dummies",
 ]
 optional = true
-version = "0.29.0"
+version = "0.30.0"
 
 [features]
 dataframe = ["default"]

crates/nu-cmd-dataframe/src/dataframe/series/date/as_datetime.rs

@@ -148,7 +148,6 @@ fn command(
             TimeUnit::Nanoseconds,
             false,
             false,
-            true,
             None,
         )
     };