ci: temporarily disable overflow checks again. #90228
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#89776 enabled overflow checks in CI but these lead to two failures already:
#90042 (comment)
#90222 (comment)
The (first?) problem has been identified: #90227
This PR temporarily disables the overflow checks again so we don't have to deal with the "spurious" CI failures until rustc-rayon is fixed.
Zulip discussion: https://rust-lang.zulipchat.com/#narrow/stream/131828-t-compiler/topic/ci.20failed.20with.20.20.22attempt.20to.20subtract.20with.20overflow.22