Update bumpalo to fix RUSTSEC-2020-0006
Update bumpalo to fix RUSTSEC-2020-0006

Closes: #3124
Approved by: sausagee

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