chore(deps): update pnpm to v8.15.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
pnpm (source)	8.15.5 -> 8.15.6

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Release Notes

pnpm/pnpm (pnpm)

v8.15.6

Compare Source

Patch Changes

• The exit code of the child process should be preserved on pnpm run #​7817.
• When sorting packages in a workspace, take into account workspace dependencies specified as peerDependencies #​7813.
• Add --ignore-scripts argument to prune command #​7836.

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