Update minimum pnpm version

[anomiex]

Changes proposed in this Pull Request:

Pnpm v7.9.0 and v7.9.2 each bring some changes to the lockfile. Update
the minimum version accordingly.

Other information:

• Have you written new tests for your changes, if applicable?
• Have you checked the E2E test CI results, and verified that your changes do not break them?

Jetpack product discussion

None

Does this pull request change what data or activity we track or use?

No

Testing instructions:

• Everything should work as before, except for a message to upgrade pnpm if you're on a lower version.

[matticbot]

Caution: This PR has changes that must be merged to WordPress.com
Hello anomiex! These changes need to be synced to WordPress.com - If you 're an a11n, please commandeer and confirm D86240-code works as expected before merging this PR. Once this PR is merged, please commit the changes to WP.com. Thank you!
This revision will be updated with each commit to this PR

[github-actions]

Thank you for your PR!

When contributing to Jetpack, we have a few suggestions that can help us test and review your patch:

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[kraftbj]

Upgraded to 7.9.2, worked as expected.

[anomiex]

r250979-wpcom

[github-actions]

Great news! One last step: head over to your WordPress.com diff, D86240-code, and deploy it.
Once you've done so, come back to this PR and add a comment with your SVN changeset ID (e.g. r12345-wpcom).

Thank you!