grep: pin onig_sys instead of a wildcard version

[sylvestre]

No description provided.

[Copilot]

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[codspeed-hq]

Merging this PR will not alter performance

✅ 10 untouched benchmarks
⏩ 17 skipped benchmarks¹

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_{Comparing sylvestre:fix-onig-sys-wildcard (1fea766) with main (2ff48db)}

Footnotes

1. 17 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[lhecker]

BTW how do you tell Cargo to just use whatever dependency version another dependency already got? Like, how could we say "use whatever onig-sys version onig already uses"? I was hoping "*" would achieve that.

[sylvestre]

Cargo publish refuses that. He wants an explicit version