Fix timestamp attribute in junit xml report

[romain-gilles-ultra]

There is a bug in the way the testsuite element is generated.

Actual

    <testsuite name="MyTest" tests="4" failures="0" errors="0" skipped="0"
               time="0.724">
        timestamp=2024-05-21T18:57:25
        ...
    </testsuite>

Expected

    <testsuite name="MyTest" tests="4" failures="0" errors="0" skipped="0"
               time="0.724" timestamp="2024-05-21T18:57:25">
        ...
    </testsuite>

The timestamp attribute in not an attribute...

[lefou]

It would be nice to have some unit test that covers the generated xml document.

[romain-gilles-ultra]

Hi @lefou It's fun you were talking about unit test. I was working on it So yes I will add unit test in another PR.