docs: native command for pnpm

[jkowalleck]

Description

Acknowledge native sub-command for PNPM - https://pnpm.io/cli/sbom

Resolves or fixes issue:

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[codacy-production]

Up to standards ✅

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[Copilot]

Pull request overview

Updates the project documentation to reflect that pnpm now has a native SBOM generation command, aligning the README’s ecosystem/tool mapping with current pnpm capabilities and recording the change in the changelog.

Changes:

• Replace the README’s pnpm “to be announced” entry with a link to the native pnpm sbom subcommand.
• Add an “unreleased” changelog entry documenting the pnpm docs update and referencing PR #406.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
README.md	Updates the pnpm row to point to the native pnpm sbom command documentation.
HISTORY.md	Adds an unreleased Docs entry referencing this documentation update (via #406).

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