Upgrade Rust to 1.52.0 (#17096)

* Upgrade Rust to 1.52.0
update nightly_version to newly pushed docker image
fix clippy lint errors
1.52 comes with grcov 0.8.0, include this version to script

* upgrade to Rust 1.52.1

* disabling Serum from downstream projects until it is upgraded to Rust 1.52.1

tokens/src/commands.rs

@@ -423,6 +423,7 @@ fn distribute_allocations(
     Ok(())
 }
 
+#[allow(clippy::needless_collect)]
 fn read_allocations(
     input_csv: &str,
     transfer_amount: Option<u64>,