update libmapper version to 2.4.6

[aburt2]

the python binding for libmapper v2.4.5 does not seem to work on Windows 11, crashing with an access violation error.

libmapper v2.4.6 fixes this (don't know how but it doesn't crash at least), can the requirements.txt be updated to use v2.4.6.

Error message below:
Traceback (most recent call last): File "C:\Python\lib\runpy.py", line 196, in _run_module_as_main return _run_code(code, main_globals, None, File "C:\Python\lib\runpy.py", line 86, in _run_code exec(code, run_globals) File "C:\Users\aniyo\Documents\GitHub\webmapper\webmapper.py", line 79, in <module> webmapper_dev = mpr.Device("webmapper", graph) File "C:\Python\lib\site-packages\libmapper\mapper.py", line 1258, in __init__ self._obj = mpr.mpr_dev_new(cname, graph) OSError: exception: access violation reading 0x0000000000000008

[malloch]

Done!

[malloch]

Updated requirements.txt:

• libmapper 2.4.6
• mappersession 0.0.15