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

perf/src/recycler.rs

@@ -71,6 +71,7 @@ fn warm_recyclers() -> bool {
 }
 
 impl<T: Default + Reset + Sized> Recycler<T> {
+    #[allow(clippy::needless_collect)]
     pub fn warmed(num: usize, size_hint: usize) -> Self {
         let new = Self::default();
         if warm_recyclers() {