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.

Cargo.lock

@@ -4540,8 +4540,7 @@ checksum = "1e061d1b48cb8d38042de4ae0a7a6401009d6143dc80d2e2d6f31f0bdd6470c7"
 [[package]]
 name = "resolvematrix"
 version = "1.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3121df844d2f59c801c703af7200b8dab5d1c04c5032cd57fa9347440346fe87"
+source = "git+https://forgejo.ellis.link/continuwuation/resolvematrix?rev=397294dd7fbae7b43678140fec64ff50cc1f6ab6#397294dd7fbae7b43678140fec64ff50cc1f6ab6"
 dependencies = [
  "futures",
  "hickory-resolver",