[issue30947] Update embeded copy of libexpat to 2.2.2

[STINNER Victor]

STINNER Victor added the comment:

About the 3 security fixes (is the last change a security fix?).

"""
             #43  Protect against compilation without any source of high
                    quality entropy enabled, e.g. with CMake build system;
                    commit ff0207e6076e9828e536b8d9cd45c9c92069b895
"""

Since Python uses its own entropy source, I don't think that this change impacts us.

https://github.com/libexpat/libexpat/commit/ff0207e6076e9828e536b8d9cd45c9c92069b895


"""
             #60  Windows with _UNICODE:
                    Unintended use of LoadLibraryW with a non-wide string
                    resulted in failure to load advapi32.dll and degradation
                    in quality of used entropy when compiled with _UNICODE for
                    Windows; you can launch existing binaries with
                    EXPAT_ENTROPY_DEBUG=1 in the environment to inspect the
                    quality of entropy used during runtime; commits
                    * 95b95032f907ef1cd17ee7a9a1768010a825d61d
                    * 73a5a2e9c081f49f2d775cf7ced864158b68dc80
"""

I don't understand the consequence of this specific bug.

https://github.com/libexpat/libexpat/commit/95b95032f907ef1cd17ee7a9a1768010a825d61d
https://github.com/libexpat/libexpat/commit/73a5a2e9c081f49f2d775cf7ced864158b68dc80


"""
   [MOX-006]      Fix non-NULL parser parameter validation in XML_Parse;
                    resulted in NULL dereference, previously;
                    commit ac256dafdffc9622ab0dc2c62fcecb0dfcfa71fe
"""

I'm not sure that it's possible to call XML_Parse() with NULL in Python.

https://github.com/libexpat/libexpat/commit/ac256dafdffc9622ab0dc2c62fcecb0dfcfa71fe

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