stack/slapos.cfg: version up dateparser for py3
0.7.6 is the last version that support py2
but it has memory leak, which is only fixed at https://github.com/scrapinghub/dateparser/releases/tag/v1.1.8
let's upgrade version only for py3
, to check if it fix the testGC
when do import dateparser
we need to update to 1.2.1, pytz to 2025.2
, also tzlocal to 5.3.1
otherwise some zodbtools tests failed