Update dependabot supported package managers with new versions of pnpm and npm

[StefanBRas]

Why:

This github blogpost: https://github.blog/changelog/2026-10-20-dependabot-now-supports-npm-12-pnpm-11-and-12-and-bun-1-4/ says that new versions of pnpm and npm are now supported.

Closes:

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

This PR adds npm 12 and pnpm 11/12 to the overview.

Check off the following:

• 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.

[github-actions]

How to review these changes 👓

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Table of review links

Note: Please update the URL for your staging server or codespace.

The table shows the files in the content directory that were changed in this pull request. This helps you review your changes on a staging server. Changes to the data directory are not included in this table.

Source	Review	Production	What Changed
code-security/reference/supply-chain-security/dependabot-options-reference.md	fpt ghec ghes@ 3.22 3.21 3.20 3.19 3.18	fpt ghec ghes@ 3.22 3.21 3.20 3.19 3.18
code-security/reference/supply-chain-security/supported-ecosystems-and-repositories.md	fpt ghec ghes@ 3.22 3.21 3.20 3.19 3.18	fpt ghec ghes@ 3.22 3.21 3.20 3.19 3.18	from reusable

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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[Copilot]

🟡 Changes recommended

The corresponding options-reference table still lists older versions, leaving contradictory support information.

1 open issue

• Update Dependabot package ecosystem reference for npm v12 and pnpm v11/v12 · New

What changed in this PR

Updates Dependabot’s shared package-manager support table to reflect newly supported versions.

Changes:

• Adds npm v12.
• Adds pnpm v11 and v12.

File	Description
data/​reusables/​dependabot/​supported-package-managers.md	Extends the supported npm and pnpm version lists.

_{Review effort: Max}