'brew tap dunn/emacs' fails on MacOs 11.1

[Tonna]

Tried to start using dunn/emacs.

$ brew tap dunn/emacs
Updating Homebrew...
==> Tapping dunn/emacs
Cloning into '/usr/local/Homebrew/Library/Taps/dunn/homebrew-emacs'...
remote: Enumerating objects: 6304, done.
remote: Total 6304 (delta 0), reused 0 (delta 0), pack-reused 6304
Receiving objects: 100% (6304/6304), 1004.13 KiB | 1.29 MiB/s, done.
Resolving deltas: 100% (4592/4592), done.
Error: Invalid formula: /usr/local/Homebrew/Library/Taps/dunn/homebrew-emacs/Formula/cider.rb
cider: Calling depends_on :java is disabled! Use "depends_on "openjdk@11", "depends_on "openjdk@8" or "depends_on "openjdk" instead.
Please report this issue to the dunn/emacs tap (not Homebrew/brew or Homebrew/core), or even better, submit a PR to fix it:
  /usr/local/Homebrew/Library/Taps/dunn/homebrew-emacs/Formula/cider.rb:11

Error: Cannot tap dunn/emacs: invalid syntax in tap!

$ sw_vers
ProductName:	macOS
ProductVersion:	11.1
BuildVersion:	20C69