Avoid races during revocation fetches

[djc]

Fixes #31.

[djc]

Should we renumber these?

[ctz]

I think renumbering at this point is OK, in the end we'll want to avoid deleting, renaming or renumbering items altogether

[codspeed-hq]

Merging this PR will not alter performance

✅ 4 untouched benchmarks

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_{Comparing racing (eaedcd2) with main (e50cbf9)}

[ctz]

I think renumbering at this point is OK, in the end we'll want to avoid deleting, renaming or renumbering items altogether