fix(api): @polkadot/util-crypto is not listed as a dependency

[nikitayutanov]

Problem

@polkadot/util-crypto library is actively used across @gear-js/api, however is not specified in the package.json as a dependency.

Steps

Encountered this issue during recent dApps update.

1. If @polkadot/util-crypto is not used in a React application, remove it from project's dependencies.
2. Try to build application's Docker image.

Possible Solution

Specify @polkadot/util-crypto in the @gear-js/api package.json.