docs: match MSRV with Cargo.toml contents

Author: coryan

README.md

@@ -77,7 +77,7 @@ Note: The `rkyv{,-16,-32,-64}` features are mutually exclusive.
 
 ## Rust version requirements
 
-The Minimum Supported Rust Version (MSRV) is currently **Rust 1.61.0**.
+The Minimum Supported Rust Version (MSRV) is currently **Rust 1.62.0**.
 
 The MSRV is explicitly tested in CI. It may be bumped in minor releases, but this is not done
 lightly.