keep sqlparser at 39 until polars is upgraded (#12311)

# Description

This PR reverts sqlparser to 0.39.0. It should stay here until we can
get polars updated so that we don't have to have two versions of
sqlparser.

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crates/nu-cmd-dataframe/Cargo.toml

@@ -24,7 +24,8 @@ fancy-regex = { workspace = true }
 indexmap = { workspace = true }
 num = { version = "0.4", optional = true }
 serde = { workspace = true, features = ["derive"] }
-sqlparser = { version = "0.44", optional = true }
+# keep sqlparser at 0.39.0 until we can update polars
+sqlparser = { version = "0.39.0", optional = true }
 polars-io = { version = "0.37", features = ["avro"], optional = true }
 polars-arrow = { version = "0.37", optional = true }
 polars-ops = { version = "0.37", optional = true }