Can't use DOT source for dnscrypt-proxy 2.1.14

[jwfang]

Following configuration's two keys either report Incompatible key identifiers or Invalid or unsupported stamp

[sources.quad9-resolvers-dot]
urls = ['https://raw.githubusercontent.com/Quad9DNS/dnscrypt-settings/main/dnscrypt/quad9-resolvers-dot.md']
#minisign_key = 'RWQBphd2+f6eiAqBsvDZEBXBGHQBJfeG6G+wJPPKxCZMoEQYpmoysKUN'
minisign_key = 'RWTp2E4t64BrL651lEiDLNon+DqzPG4jhZ97pfdNkcq1VDdocLKvl5FW'
cache_file = 'quad9-resolvers-dot.md'
prefix = 'quad9-'