Upgrade to Rust 1.43.0 (bp #9754) (#9807)

* Upgrade to Rust 1.43.0 (#9754)

(cherry picked from commit 230df0ec0c)

# Conflicts:
#	core/src/validator.rs
#	runtime/src/accounts_db.rs

* Update validator.rs

* Update accounts_db.rs

Co-authored-by: Michael Vines <mvines@gmail.com>

logger/src/lib.rs

@@ -5,7 +5,7 @@ use std::sync::{Arc, RwLock};
 
 lazy_static! {
     static ref LOGGER: Arc<RwLock<env_logger::Logger>> =
-        { Arc::new(RwLock::new(env_logger::Logger::from_default_env())) };
+        Arc::new(RwLock::new(env_logger::Logger::from_default_env()));
 }
 
 struct LoggerShim {}