benchmarks: Provide correctness scores for the listed WPT commit

[andersk]

Using web-platform-tests/wpt@4830edb as documented in the footnote (rather than latest), we get

======================================================================
CORRECTNESS RESULTS
======================================================================
Parser              Passed     Failed     Errors    Skipped    Pass Rate
----------------------------------------------------------------------
justhtml              1880          0          0         40      100.00%
html5lib              1547        333          0         40       82.29%
html5_parser           916        964          0         40       48.72%
lxml                    17       1818         45         40        0.90%
bs4                      6       1874          0         40        0.32%
html.parser              6       1874          0         40        0.32%
selectolax            1880          0          0         40      100.00%
markupever            1788         92          0         40       95.11%
turbohtml             1800         80          0         40       95.74%
----------------------------------------------------------------------
Non-script test cases: 1880
Pass rate: passed / (passed + failed + errors); unsupported non-script capabilities count as failures.

Update the table with these numbers for fairness.

[EmilStenstrom]

I'll update to the latest version of WPT instead.