Homebrew Occasionally Gives Warning That valkyrie00/bbrew is Untrusted

Starting about a week ago, the Homebrew section in the ujust update command began giving me an occasional (every couple of days) warning about untrusted taps:

── 19:50:47 - Brew ─────────────────────────────────────────────────────────────
==> Updating Homebrew…
Already up-to-date.
Warning: The following taps are not trusted:
valkyrie00/bbrew

Homebrew will ignore formulae, casks and commands from these taps when `HOMEBREW_REQUIRE_TAP_TRUST` is set.
This will become the default in Homebrew 6.0.0 or 5.2.0, whichever comes first.
Enable trust checks now with:
export HOMEBREW_REQUIRE_TAP_TRUST=1
Trust specific formulae, casks or commands with:
brew trust --formula //
brew trust --cask //
brew trust --command //
or trust installed formulae from these taps with:
brew trust --formula valkyrie00/bbrew/bbrew
You can trust all formulae, casks and commands from these taps with:
brew trust valkyrie00/bbrew
Prefer trusting only the specific formulae, casks or commands you need.
Untap them with:
brew untap valkyrie00/bbrew
To keep allowing them by default during the transition:
export HOMEBREW_NO_REQUIRE_TAP_TRUST=1
This is not recommended and will be removed in a later release.

So far, that warning has been just on valkyrie00/bbrew. The first time I got that warning, I followed the instructions to enable trust checks with:

export HOMEBREW_REQUIRE_TAP_TRUST=1

Since I’m still getting the warning on whatever that valkyrie00/bbrew thing is, I also tried following the instructions to untap it with:

brew untap valkyrie00/bbrew

But that just gives me an error:

Error: Refusing to untap valkyrie00/bbrew because it contains the following installed formulae or casks:
bbrew

EDIT: From what I can find, I’m pretty sure bbrew (Bold Brew) is pre-installed on Universal Blue distributions (since I didn’t install it (AFAIK)) and valkyrie00 is the developer. So, this ought to be trusted.

What am I supposed to do?

This is a change coming from upstream Homebrew. It will be mandatory to trust 3rd party/external taps in the next upstream release.

So you can just follow the instructions and trust the tap