Merge from origin/emacs-29

Merge from origin/emacs-29

4520f09dd8b ; * admin/git-bisect-start: Update failing commits
2569ede9c49 Update to Org 9.6-81-g563a43
d9ed736f0a7 ruby-ts-mode: Remove some currently unused functions
45618447203 ruby-ts-mode: Highlight singleton method definitions and ...
0562006da3b Add ruby-ts-mode
84e7c2fbc85 Fix fontification of C++ reference return types (bug#60441)
1864b65af60 ; Minor fix for treesit--install-language-grammar-1 (bug#...
8994f87ad40 Adjust function-call fontification in csharp-ts-mode (bug...
411647a3f65 ; Fix NEWS.
7b0b17df67e Rewrite Antinews in ELisp manual for Emacs 29
f12f72b0e09 ; * lisp/simple.el (primitive-undo): Clarify error messag...
7fd822e7f52 Update Antinews in the user manual for Emacs 29
da77d70deeb ; * test/lisp/emacs-lisp/copyright-tests.el: Fix and futu...
2baf9e107c1 Fix shortdoc-tests failure with respect to regexp-opt-cha...
5aeb8de32ee ; Fix copyright years in 2 more files.

# Conflicts:
#	etc/NEWS