Punycode domains not working

[devvick]

Describe the bug
I cannot add a URL with punycode domain as feed.

To Reproduce
Steps to reproduce the behavior:

1. Try adding https://xn--gckvb8fzb.com/index.xml as feed.
2. Error: jakarta.ws.rs.WebApplicationException: マリウス.com: Name or service not known

Expected behavior
Able to add a punycode domain as feed

Environment (please complete the following information):

• self-hosted (official Docker image -jvm version)
  CommaFeed version 5.3.3 (a337b01).

Additional info
The domain is resolvable from the same host:

$ drill xn--gckvb8fzb.com
;; ->>HEADER<<- opcode: QUERY, rcode: NOERROR, id: 6792
;; flags: qr rd ra ; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 
;; QUESTION SECTION:
;; xn--gckvb8fzb.com.	IN	A

;; ANSWER SECTION:
xn--gckvb8fzb.com.	300	IN	A	143.244.50.83

[Athou]

I released 5.3.4 with a fix for this, thank you for the bug report!

[devvick]

Thank you, that was incredibly fast 💨