Suggest `keys.openpgp.org` as keyserver
Suggest `keys.openpgp.org` as keyserver

See https://github.com/bitcoin/bitcoin/pull/23466
bitcoin-core/bitcoincore.org,bitcoin-core/bitcoincore.org,bitcoin-core/bitcoincore.org,bitcoin-core/bitcoincore.org,bitcoin-core/bitcoincore.org,bitcoin-core/bitcoincore.org