Update pnpm to v8.6.8

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
pnpm (source)	8.6.7 -> 8.6.8

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Release Notes

pnpm/pnpm (pnpm)

v8.6.8

Compare Source

Patch Changes

• When the same file is appended multiple times into a tarball, the last occurrence is selected when unpacking the tarball.
• Fixed a bug in which pnpm passed the wrong scheme to git ls-remote, causing a fallback to git+ssh and resulting in a 'host key verification failed' issue #​6805.
• Added support for publishConfig.registry in package.json for publishing #​6775.
• pnpm rebuild now uploads the built artifacts to the content-addressable store.
• If a command cannot be created in .bin, the exact error message is now displayed.
• Treat linked dependencies with a tag version type as up-to-date #​6592.
• pnpm setup now prints more details when it cannot detect the active shell.

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