Update pnpm to v7

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
pnpm (source)	6.32.3 -> 7.6.0
pnpm (source)	6 -> 7

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Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Renovate will not automatically rebase this PR, because other commits have been found.

🔕 Ignore: Close this PR and you won't be reminded about these updates again.

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• If you want to rebase/retry this PR, click this checkbox. ⚠ Warning: custom changes will be lost.

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This PR has been generated by Mend Renovate. View repository job log here.

[renovate]

⚠ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: pnpm-lock.yaml

installing v2 tool pnpm v6.33.1
npm WARN config global `--global`, `--local` are deprecated. Use `--location=global` instead.

added 1 package in 2s
linking tool pnpm v6.33.1
6.33.1
Installed v2 /usr/local/buildpack/tools/v2/pnpm.sh in 4 seconds
 WARN  The "store" setting has been renamed to "store-dir". Please use the new name.
 ERR_PNPM_UNSUPPORTED_ENGINE  Unsupported environment (bad pnpm and/or Node.js version)

Your pnpm version is incompatible with "/mnt/renovate/gh/esdmr/box-drawing-sidebar".

Expected version: 7
Got: 6.33.1

This is happening because the package's manifest has an engines.pnpm field specified.
To fix this issue, install the required pnpm version globally.

To install the latest version of pnpm, run "pnpm i -g pnpm".
To check your pnpm version, run "pnpm -v".