Homebrew cask versions does not exist?

[fatflash]

Output of brew config

HOMEBREW_VERSION: 4.5.6-16-g8aeb93e
ORIGIN: https://github.com/Homebrew/brew
HEAD: 8aeb93ec98d0d73fc23aba9b84f705dd226c21cf
Last commit: 5 hours ago
Branch: master
Core tap JSON: 11 Jun 12:44 UTC
Core cask tap JSON: 11 Jun 12:44 UTC
HOMEBREW_PREFIX: /opt/homebrew
HOMEBREW_CASK_OPTS: []
HOMEBREW_MAKE_JOBS: 12
HOMEBREW_SORBET_RUNTIME: set
Homebrew Ruby: 3.4.4 => /opt/homebrew/Library/Homebrew/vendor/portable-ruby/3.4.4/bin/ruby
CPU: dodeca-core 64-bit arm_blizzard_avalanche
Clang: 17.0.0 build 1700
Git: 2.39.5 => /Library/Developer/CommandLineTools/usr/bin/git
Curl: 8.7.1 => /usr/bin/curl
macOS: 15.5-arm64
CLT: 16.4.0.0.1.1747106510
Xcode: N/A
Rosetta 2: false

Output of brew doctor

Please note that these warnings are just used to help the Homebrew maintainers
with debugging if you file an issue. If everything you use Homebrew for is
working fine: please don't worry or file an issue; just ignore this. Thanks!

Warning: You have the following deprecated, official taps tapped:
  Homebrew/homebrew-cask-versions
Untap them with `brew untap`.

Warning: Unbrewed dylibs were found in /usr/local/lib.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae and may need to be deleted.

Unexpected dylibs:
  /usr/local/lib/libCMDServices.1.0.0.dylib
  /usr/local/lib/libMuseSamplerCoreLib.dylib
  /usr/local/lib/libcrypto.3.dylib
  /usr/local/lib/libcurl.4.dylib
  /usr/local/lib/libfontconfig.1.dylib
  /usr/local/lib/libfreetype.6.dylib
  /usr/local/lib/libjpeg.62.dylib
  /usr/local/lib/libopenjp2.2.4.0.dylib
  /usr/local/lib/libpng16.16.dylib
  /usr/local/lib/libpoppler.129.dylib
  /usr/local/lib/libpteidapplayer.2.0.0.dylib
  /usr/local/lib/libpteidcardlayer.2.0.0.dylib
  /usr/local/lib/libpteidcommon.2.0.0.dylib
  /usr/local/lib/libpteiddialogsQT.2.0.0.dylib
  /usr/local/lib/libpteidlib.2.0.0.dylib
  /usr/local/lib/libpteidlibj.2.0.0.dylib
  /usr/local/lib/libpteidpkcs11.2.0.0.dylib
  /usr/local/lib/libssl.3.dylib
  /usr/local/lib/libtiff.6.dylib
  /usr/local/lib/libxerces-c-3.2.dylib
  /usr/local/lib/libxml-security-c.20.dylib
  /usr/local/lib/libzip.5.5.dylib

Warning: Unbrewed header files were found in /usr/local/include.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae and may need to be deleted.

Unexpected header files:
  /usr/local/include/eidErrors.h
  /usr/local/include/eidlib.h
  /usr/local/include/eidlibException.h
  /usr/local/include/eidlibcompat.h
  /usr/local/include/eidlibdefines.h

Description of issue

When updating running brew update I get this error:
==> Updating Homebrew...
remote: Invalid username or password.
fatal: Authentication failed for 'https://github.com/Homebrew/homebrew-cask-versions/'
Error: homebrew/homebrew-cask-versions does not exist! Run brew untap homebrew/homebrew-cask-versions to remove it.

Upon trying it again:
==> Updating Homebrew...
fatal: could not read Username for 'https://github.com': terminal prompts disabled
Error: homebrew/homebrew-cask-versions does not exist! Run brew untap homebrew/homebrew-cask-versions to remove it.

Relevant casks

Homebrew

[SMillerDev]

It has not been supported and was marked as archived since May last year.

[james-franchino]

Interesting. I also just had this pop up for the first time today. I untapped it and it works fine now, but I wonder why it only popped up just now.