Bump pnpm to 8.15.0, improving CI partial install

[jakebailey]

pnpm/pnpm#7563 is now released, which should reduce the likelihood that we need the workaround introduced in #67460. There are still PRs which will OOM and fall back to a full install, but partial installs should succeed more often.

[typescript-bot]

@jakebailey Thank you for submitting this PR!

This is a live comment which I will keep updated.

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---

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[typescript-bot]

🔔 @jakebailey — there are no owners, but it would still be good if you find someone to review this PR in the next few days, otherwise a maintainer will look at it. (And if you do find someone, maybe even recruit them to be a second owner to make future changes easier...)

[typescript-bot]

@jakebailey: Everything looks good here. I am ready to merge this PR (at 356bed9) on your behalf whenever you think it's ready.

If you'd like that to happen, please post a comment saying:

Ready to merge

and I'll merge this PR almost instantly. Thanks for helping out! ❤️

[jakebailey]

Ready to merge