www/py-jh2: Fix build after 75f9a60e9790

• The 1.8.2 release of devel/py-maturin uses a updated version of the "pyproject-toml" crate which is stricter with regard to license metadata:

[...]
maturin failed

Caused by: pyproject.toml at /wrkdirs/usr/ports/www/py-jh2/work-py311/jh2-5.0.7/pyproject.toml is invalid
Caused by: TOML parse error at line 9, column 17
|

9 | license-files = { paths = ["LICENSE"] }

|                 ^^^^^^^^^^^^^^^^^^^^^^^

[...]

Approved by: portmgr (build fix blanket)