bug#70076: 28.3; xml-escape-string parse issue

[D. Schmudde]

Starting with `emacs -Q`:

(require 'xml)
(xml-escape-string "And now it\342\200\231s all this")

The result is: `xml-escape-string: Invalid XML character: 4194274, 
11`

I expect that the string will parse correctly with these escape 
characters. Or is this expectation wrong?

In GNU Emacs 28.3 (build 1, x86_64-pc-linux-gnu, GTK+ Version 
3.24.33, cairo version 1.16.0)
of 2023-08-25 built on pop-os
Repository revision: dec958258b133b4c21224c594da433919d852800
Repository branch: emacs-28
System Description: Pop!_OS 22.04 LTS

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ 
JPEG
JSON LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES 
NOTIFY
INOTIFY PDUMPER PNG RSVG SECCOMP SOUND THREADS TIFF 
TOOLKIT_SCROLL_BARS
X11 XDBE XIM XPM GTK3 ZLIB
Important settings:
 value of $LANG: en_US.UTF-8
 value of $XMODIFIERS: @im=ibus
 locale-coding-system: utf-8-unix



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