Update seeds

Summary: As per title.

Test Plan:
Used the script from D3809 to connect the nodes:
On mainnet: 93% success
On testnet: 90% success

Reviewers: #bitcoin_abc, deadalnix, Mengerian

Reviewed By: #bitcoin_abc, Mengerian

Subscribers: Mengerian

Differential Revision: https://reviews.bitcoinabc.org/D3971