cleanup

Imports

• go.uber.org/zap
• golang.org/x/sync/errgroup

Imports in module “go.flipt.io/flipt”

• go.flipt.io/flipt/internal/config
• go.flipt.io/flipt/internal/storage/authn
• go.flipt.io/flipt/internal/storage/oplock

Standard library imports

• context
• fmt
• time