How to "backport" a patch from master to emacs-28?

["Harald Jörg" <haj@posteo.de>]

Hello Emacs developers,

I made two mistakes: The first was a simple software bug in a commit to
Emacs master in September 2021.  The second mistake was to fix the bug
in master in November 2021: This fix is not in Emacs 28.2, and it is not
in the emacs-28 branch.  This was brought to my attention by an Emacs
user via the now-retired fork of CPerl mode in
https://github.com/jrockway/cperl-mode/issues/59.

I understand that the usual procedure is to merge _from_ the release
branches _to_ master, but that ship has sailed.  Is it ok to cherry-pick
the single commit and push it to emacs-28?  It is a trivial patch,
below is what "git show" has to say.

commit a25e91593d48a541b5940a2ed707ddfaef5c953f
Author: Harald Jörg <haj@posteo.de>
Date:   Wed Nov 3 15:04:10 2021 +0100

    ; cperl-mode.el: Fix one match-count in my commit 2021-09-14
    
    * lisp/progmodes/cperl-mode.el (cperl-init-faces): Matching group needs
    to be adjusted according to the regexp change in my previous commit

diff --git a/lisp/progmodes/cperl-mode.el b/lisp/progmodes/cperl-mode.el
index 1afeb60ac5..a23505a9d3 100644
--- a/lisp/progmodes/cperl-mode.el
+++ b/lisp/progmodes/cperl-mode.el
@@ -5951,7 +5951,7 @@ cperl-init-faces
                                         (eval cperl--basic-identifier-rx)))
                    (0+ blank) "(")
 ;;         '("\\<for\\(each\\)?\\([ \t]+\\(state\\|my\\|local\\|our\\)\\)?[ \t]*\\(\\$[a-zA-Z_][a-zA-Z_0-9]*\\)[ \t]*("
-             4 font-lock-variable-name-face)
+             1 font-lock-variable-name-face)
            ;; Avoid $!, and s!!, qq!! etc. when not fontifying syntactically
            '("\\(?:^\\|[^smywqrx$]\\)\\(!\\)" 1 font-lock-negation-char-face)
            '("\\[\\(\\^\\)" 1 font-lock-negation-char-face prepend)))

-- 
Cheers,
haj