compat.texi: Fix references to Emacs 30.1 in Support section

Fixes: ``` makeinfo compat.texi compat.texi:2251: warning: node `Emacs 30.1' is next for `Emacs 29.1' in sectioning but not in menu compat.texi:3316: warning: node `Emacs 29.1' is prev for `Emacs 30.1' in sectioning but not in menu compat.texi:3316: warning: node `Support' is up for `Emacs 30.1' in sectioning but not in menu compat.texi:300: node `Support' lacks menu item for `Emacs 30.1' despite being its Up target make: *** [Makefile:116: compat.info] Error 1 ```