chore: add Planning-Inspectorate to governments.yml

[beejjacobs]

I have added the following:

Your Organization: Planning-Inspectorate
GitHub Organization url: @Planning-Inspectorate
Country/Locality: United Kingdom

Inclusion requirements:

• Referenced account is an Organization not a User^
• If this is a government project, your Organization's description should include a reference to your country/agency.
• Make sure your Organization includes at least one public repository
• Please also include a URL for your organization that links back to your organization or agency homepage.

[Copilot]

Pull request overview

This PR adds the Planning Inspectorate, a UK government organization, to the government.github.com registry by including their GitHub organization in the governments.yml configuration file.

Changes:

• Added "Planning-Inspectorate" to the U.K. Central government organizations list

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