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/append_vec.rs

@@ -883,7 +883,7 @@ pub mod tests {
             let executable_bool: &bool = &account.account_meta.executable;
             // Depending on use, *executable_bool can be truthy or falsy due to direct memory manipulation
             // assert_eq! thinks *executable_bool is equal to false but the if condition thinks it's not, contradictorily.
-            assert_eq!(*executable_bool, false);
+            assert!(!*executable_bool);
             const FALSE: bool = false; // keep clippy happy
             if *executable_bool == FALSE {
                 panic!("This didn't occur if this test passed.");
@@ -894,7 +894,7 @@ pub mod tests {
         // we can NOT observe crafted value by value
         {
             let executable_bool: bool = account.account_meta.executable;
-            assert_eq!(executable_bool, false);
+            assert!(!executable_bool);
             assert_eq!(account.get_executable_byte(), 0); // Wow, not crafted_executable!
         }