chore(deps): update pnpm to v7.1.8

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
pnpm (source)	7.1.7 -> 7.1.8

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Release Notes

pnpm/pnpm

### [`v7.1.8`](https://togithub.com/pnpm/pnpm/releases/tag/v7.1.8) [Compare Source](https://togithub.com/pnpm/pnpm/compare/v7.1.7...v7.1.8) #### Patch Changes - Suggest updating using Corepack, when pnpm was installed via Corepack. - It should be possible to install a git-hosted package that has no `package.json` file [#​4822](https://togithub.com/pnpm/pnpm/issues/4822). - Fix pre-compiled pnpm binaries crashing when NODE_MODULES is set. #### Our Sponsors #### What's Changed * fix: pnpm pre-compiled binaries crash when NODE_MODULES is set by @​gluxon in https://github.com/pnpm/pnpm/pull/4823 * refactor(lockfile-file): Abstract LockfileFile to Lockfile conversion by @​gluxon in https://github.com/pnpm/pnpm/pull/4824 * test: update Jest by @​zkochan in https://github.com/pnpm/pnpm/pull/4644 * fix(cli): suggest to update with Corepack by @​zkochan in https://github.com/pnpm/pnpm/pull/4854 * fix: resolve manifest promise when manifest is not found by @​zkochan in https://github.com/pnpm/pnpm/pull/4826 **Full Changelog**: https://github.com/pnpm/pnpm/compare/v7.1.7...v7.1.8

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