Revert new client

[svyatonik]

There is a couple of ongoing issues at our test deployments. And there were two major changes before we've noticed that:

• new client
• Substrate/Polkadot/Cumulus dependencies update.

I'll keep trying to reproduce issues locally, but it'd be better to know the cause of the issue - whether it is new client, or dependencies. So I suggest to revert new client temporarily and see if the issue will appear at our test deployments in next two days.

What we know so far:

• sometimes RialtoParachain is not registered in Rialto, so it isn't producing and finalizing any blocks. I've fixed similar issue here, but now I don't see any timeout in logs, so probably some other issue;
• there's something wrong with Rialto <> Millau bridge - when it breaks, it looks as follows:

bridges-bot
[[Alerting] Messages from Millau to Rialto are not being delivered](http://grafana.millau.brucke.link/d/relay-millau-to-rialto-messages/millau-to-rialto-message-sync-dashboard?tab=alert&viewPanel=10&orgId=1)
Millau Messages delivered to Rialto in last 5m: 0
[[Alerting] Messages from Rialto to Millau are not being delivered](http://grafana.millau.brucke.link/d/relay-rialto-to-millau-messages/rialto-to-millau-message-sync-dashboard?tab=alert&viewPanel=10&orgId=1)
Rialto Messages delivered to Millau in last 5m: 0
bridges-bot
[[Alerting] Rialto -> Millau messages are not detected by relay](http://grafana.millau.brucke.link/d/relay-rialto-to-millau-messages/rialto-to-millau-message-sync-dashboard?tab=alert&viewPanel=6&orgId=1)
Messages generated in last 5 minutes (Rialto -> Millau, 00000000): 0
[[Alerting] Millau -> Rialto messages are not detected by relay](http://grafana.millau.brucke.link/d/relay-millau-to-rialto-messages/millau-to-rialto-message-sync-dashboard?tab=alert&viewPanel=6&orgId=1)
Messages generated in last 5 minutes (Millau -> Rialto, 00000000): 0

So either relay can't read data from nodes (then the cause is the new client), or Rialto and Millau nodes are broken (then the cause is dependencies).