fix: Use correct DNS caching for SNI to function properly

This removes the old (broken) DNS caching method for reqwest, and replaces
it with resolvematrix' `MatrixDnsResolver`, as it correctly implements
caching and overrides for correct SNI behavior.

src/service/federation/execute.rs

@@ -134,7 +134,7 @@ impl super::Service {
 		let actual = self
 			.services
 			.client
-			.resolver
+			.matrix_resolver
 			.resolve_server(dest.as_str())
 			.await?;