Update Eclair client to resolve occasional test flakiness

[rockstardev]

Eclair requires an update, as the version we're currently using was released over a year ago. They've recently released an updated latest image, which you can find here: https://hub.docker.com/r/acinq/eclair/tags.

With the LND 0.17.4 update, we've started encountering flaky tests related to channel connections.

During the process of updating LND to version 0.17.4 (see the pull request here: https://github.com/btcpayserver/BTCPayServer.Lightning/pull/158), I noticed these problems. Despite this, I opted to proceed with the update due to the critical bug fixes it includes, instead of waiting for the Eclair issues to be resolved.