New grin release 5.4.0 - important stability improvements

[ardocrat]

We have 0 working seeds at main branch, specify some known at config:

Call for new DNS seed nodes, Mainnet and Testnet

I noticed inability to connect to last working seed node mainn-seed.grinnode.live from Germany, also I dont see last working IP (85.10.201.143:3414) here Grin Blockchain Explorer and one of IPs (217.173.235.116:3414) uses old Grin 5.0.4 node @mcm-mike . grin seedcheck command returns this result for list above for now: [ { "url": "main.gri.mw", "dns_resolutions_found": true, "success": true, "successful_attempts": [ { "ip_addr": "80.90.182.173:3414", "ha…