[move] Remove Cargo.lock
[move] Remove Cargo.lock

- Cargo.lock was checked in when move-lang was its own workspace
- It is no longer, so the file can be removed

Closes: #1906
Approved by: bmwill

libra/libra,libra/libra,libra/libra,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,libra/libra,aptos-labs/aptos-core,libra/libra