ctre-3.9.0-bp160.1.9

- Update to version 3.9.0:
  * you can now use CTRE as C++ module! with -DCTRE_MODULE=ON
    (experimental).
  * `ctre::range` is deprecated and replaced with
    `ctre::search_all`
  * simple `ctre::capture_group` concept
  * capture groups / result type now has
    `.to_optional_number(...)` member function which returns
    `std::nullopt` if group is not matching
  * Fixed: Cannot parse Unicode ranges after question mark as in "
    ?[\p{L}]+"
    [gh#hanickadot/compile-time-regular-expressions#305]
- Pass -DCTRE_MODULE=OFF to cmake to disable CTRE module
  explicitly (requires cmake >= 3.30).

- unsigned-char.patch: Fix bogus tests that depend on signed char

- Initial version.