This update for notmuch, sfexp fixes the following issues:

notmuch:

- build with sfsexp (boo#1240535) to enable s-expression support
- Add python3-notmuch2 package with the cffi bindings.

update to 0.38.3:

  * Fix a bug in configuration code that caused the notmuch command
    to erroneously report "Error: could not locate database" under
    some circumstances

update to 0.38.2:

  * Make sorting of string maps lexicographic on (key,value)
    pairs. This avoids some test failures due to variation in
    message property output order.
  * Avoid extra separators after the last address in `notmuch-
    emacs-mua`.

update to 0.38.1:

  * Report parse errors in config files.
  * Fix image toggling for Emacs >= 29.1.
  * Support relative lastmod queries (see notmuch-sexp-queries(7)
    and notmuch-search-terms(7) for details).
  * Support indexing of designated attachments as text (see
  * notmuch-config(1) for details).
  * Add options --offset and --limit to notmuch-show(1).
  * New commands notmuch-search-edit-search and notmuch-tree-
    edit-search.
  * Introduce notmuch-tree-outline-mode.
  * Some compatibility fixes for Emacs 29. At least one issue
    (hiding images) remains in 0.38.
  * Support completion when piping to external command.
  * Fix regression in updating tag display introduced by 0.37.
  * Fix bug creating database when database.path is not set.
  * Incremental performance improvements for message deletion.
  * Catch Xapian exceptions when deleting messages.
  * Sync removed message properties to the database.
  * Replace use of thread-unsafe Query::MatchAll in the infix
    query parser.
  * Be more careful when clearing the results directory.
  * Use `database_open_with_config`, and provide compatible path
    search semantics.
  * Support testing installed version of notmuch.
  * Adapt to some breaking changes in glib handling of init
    files.
  * Replace OpenPGP key used in test suite.
  * Performance Tests
  * Update signatures for performance test corpus.

sfexp: new package in version 1.4.1, a Small Fast S-Expression Library.