Increased number of test failures (due to flaky tests?)

[jamietanna]

We're currently investigating a few

• https://github.com/renovatebot/renovate/actions/runs/20092423018/job/57642892823 lib/modules/datasource/crate/index.spec.ts on main
• https://github.com/renovatebot/renovate/actions/runs/20130530714 on main
• https://github.com/renovatebot/renovate/actions/runs/20103983080/job/57682532526 lib/util/http/index.spec.ts and lib/util/schema-utils/index.spec.ts on fix(dashboard): only add count if has deps #39889 from @setchy
• chore(deps): downgrade vitest monorepo to v4.0.15 #39904

[jamietanna]

@viceice has done some more digging and it looks like it's not vitest, but vite - we're attempting a revert in #39930

Upstream bug report: vitejs/rolldown-vite#555

[jamietanna]

Vite downgrade: #39930

[jamietanna]

And Renovate config to stop it re-updating: #39932

[viceice]

Strange, no failures on main since yesterday and before the rollback / downgrade 🤔