fix(pnpm): match package patterns that are matched by pnpm (#10389)

...ures__/pnpm-monorepo/nested-packages/group/a/package.json

...ures__/pnpm-monorepo/nested-packages/group/b/package.json

...xtures__/pnpm-monorepo/non-nested-packages/a/package.json

...xtures__/pnpm-monorepo/non-nested-packages/b/package.json

lib/manager/npm/__fixtures__/pnpm-monorepo/pnpm-lock.yaml

...anager/npm/__fixtures__/pnpm-monorepo/pnpm-workspace.yaml

...__/pnpm-monorepo/solo-package-trailing-slash/package.json

.../npm/__fixtures__/pnpm-monorepo/solo-package/package.json

lib/manager/npm/extract/__snapshots__/pnpm.spec.ts.snap

lib/manager/npm/extract/pnpm.spec.ts

lib/manager/npm/extract/pnpm.ts

lib/manager/npm/extract/utils.spec.ts