build(deps): bump pytest-cov from 5.0.0 to 6.0.0 in /requirements (#320)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements/_tests.txt

@@ -2,5 +2,5 @@ coverage ==7.2.7; python_version < '3.8'
 coverage ==7.6.*; python_version >= '3.8'
 pytest ==7.4.3; python_version < '3.8'
 pytest ==8.3.*; python_version >= '3.8'
-pytest-cov ==5.0.0
+pytest-cov ==6.0.0
 pytest-timeout ==2.3.1