alot,gpgme,notmuch: migrate to python@3.13

[chenrui333]

notmuch: migrate to python@3.13

[branchvincent]

need to also migrate alot

[chenrui333]

  ==> /opt/homebrew/opt/notmuch/bin/notmuch new
  Found 0 total files (that's not much mail).
  No new mail.
  Error: alot: failed
  An exception occurred within a child process:
    Minitest::Assertion: out.log file should exist.
  Expected #<Pathname:/private/tmp/alot-test-20241015-65978-syo3nu/out.log> to be exist?.

[chenrui333]

mailcap module got removed in py3.13, upstream issue, pazz/alot#1632

---

$ alot --version
Traceback (most recent call last):
  File "/opt/homebrew/bin/alot", line 5, in <module>
    from alot.__main__ import main
  File "/opt/homebrew/Cellar/alot/0.11_1/libexec/lib/python3.13/site-packages/alot/__main__.py", line 11, in <module>
    from alot.settings.const import settings
  File "/opt/homebrew/Cellar/alot/0.11_1/libexec/lib/python3.13/site-packages/alot/settings/const.py", line 4, in <module>
    from .manager import SettingsManager
  File "/opt/homebrew/Cellar/alot/0.11_1/libexec/lib/python3.13/site-packages/alot/settings/manager.py", line 7, in <module>
    import mailcap
ModuleNotFoundError: No module named 'mailcap'

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