[upd] ./manage pyenv.cmd searxng_extra/update/update_pygments.py

After each update of the pygments version, we (or github action) should [1]

1. update less files:

    ./manage pyenv.cmd searxng_extra/update/update_pygments.py

    update: static/themes/oscar/src/generated/pygments-logicodev.less
    update: static/themes/oscar/src/generated/pygments-pointhi.less
    update: static/themes/simple/src/generated/pygments.less

2. rebuild the static files of each themes:

    make static.build.commit

[1] https://github.com/searxng/searxng/pull/2#issuecomment-826958666



Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>