Bump alpine from 3.12.1 to 3.12.2 in /docker/ci/alpine
Bump alpine from 3.12.1 to 3.12.2 in /docker/ci/alpine

Bumps alpine from 3.12.1 to 3.12.2.

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
Closes: #6909

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