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

sdk/program/src/message.rs

@@ -865,12 +865,12 @@ mod tests {
             instructions: vec![],
         };
         let demote_sysvar_write_locks = true;
-        assert_eq!(message.is_writable(0, demote_sysvar_write_locks), true);
-        assert_eq!(message.is_writable(1, demote_sysvar_write_locks), false);
-        assert_eq!(message.is_writable(2, demote_sysvar_write_locks), false);
-        assert_eq!(message.is_writable(3, demote_sysvar_write_locks), true);
-        assert_eq!(message.is_writable(4, demote_sysvar_write_locks), true);
-        assert_eq!(message.is_writable(5, demote_sysvar_write_locks), false);
+        assert!(message.is_writable(0, demote_sysvar_write_locks));
+        assert!(!message.is_writable(1, demote_sysvar_write_locks));
+        assert!(!message.is_writable(2, demote_sysvar_write_locks));
+        assert!(message.is_writable(3, demote_sysvar_write_locks));
+        assert!(message.is_writable(4, demote_sysvar_write_locks));
+        assert!(!message.is_writable(5, demote_sysvar_write_locks));
     }
 
     #[test]

sdk/program/src/sysvar/recent_blockhashes.rs

@@ -133,11 +133,10 @@ pub fn create_test_recent_blockhashes(start: usize) -> RecentBlockhashes {
             )
         })
         .collect();
-    let bhq: Vec<_> = blocks
+    blocks
         .iter()
         .map(|(i, hash, fee_calc)| IterItem(*i, hash, fee_calc))
-        .collect();
-    bhq.into_iter().collect()
+        .collect()
 }
 
 #[cfg(test)]