Update pnpm version support in dependabot options

[raf2k07]

According to this discussion and this page, pnpm v10 is supported for both version and security updates, but the dependabot-options-reference says that v9 and v10 only have version updates.

Why:

Closes: #44030

What's being changed (if available, include any code snippets, screenshots, or gifs):

A single line change to update the package support table in the dependabot reference docs.

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• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

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Source	Review	Production	What Changed
code-security/reference/supply-chain-security/dependabot-options-reference.md	fpt ghec ghes@ 3.20 3.19 3.18 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.20 3.19 3.18 3.17 3.16 3.15 3.14

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[Copilot]

Pull request overview

Updates the Dependabot options reference to reflect current pnpm version support in the package-ecosystem table.

Changes:

• Updates the pnpm row to list v7, v8, v9, v10 as supported versions (removing the “version updates only” qualifier).

[Sharra-writes]

@raf2k07 It looks like you're probably right, but since this is code security I'm going to double check with the Dependabot team to be sure.