nats-server: fix test

[patrickhoefler]

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Fixes the failing test, seen in #88775.

More details about the varz endpoint are available at the nats-server docs.

[SMillerDev]

Thanks @patrickhoefler ! Without contributions like yours it'd be impossible to keep homebrew going with the high standards that users have come to expect from the project. You can feel good knowing that you've made the world a tiny bit better for homebrew users around the world! 👍 🎉

[patrickhoefler]

Thanks @SMillerDev for your kind words and the great work you're doing! I'm glad I could help out a little 🙂

[BrewTestBot]

🤖 A scheduled task has triggered a merge.