bump up faraday dependency

[34code]

  In Gemfile:
    coinbase_commerce was resolved to 0.8.7, which depends on
      faraday (~> 0.10)

    searchkick (~> 4.0) was resolved to 4.4.4, which depends on
      elasticsearch (>= 6) was resolved to 7.6.0, which depends on
        elasticsearch-transport (= 7.6.0) was resolved to 7.6.0, which depends on
          faraday (~> 1)

cannot update bundle due to this

[34code]

There's a PR already for this so please merge it :)

[spidzio]

faraday is already at 2.2.0. coinbase_commerce gem hasn't been released since September 2018. It's really time to bump this thing up. It's a blocker for me right now.