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

runtime/src/accounts.rs

@@ -833,6 +833,7 @@ impl Accounts {
     /// This function will prevent multiple threads from modifying the same account state at the
     /// same time
     #[must_use]
+    #[allow(clippy::needless_collect)]
     pub fn lock_accounts<'a>(
         &self,
         txs: impl Iterator<Item = &'a Transaction>,