chore: upgrade default pnpm to v9

[alexeagle]

When setting up a new Angular 20 project, @alan-agius4 and I discovered that pnpm8 has a bug. New projects should be using the right default.

BREAKING CHANGE:
Users need to add pnpm: {onlyBuiltDependencies: []} to their package.json
or downgrade back to version 8

[aspect-workflows]

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e2e/bzlmod

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e2e/gyp_no_install_script

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e2e/npm_translate_lock_empty

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e2e/npm_translate_lock_replace_packages

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e2e/npm_translate_lock_subdir_patch

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e2e/npm_translate_package_lock

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e2e/npm_translate_yarn_lock

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e2e/package_json_module

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e2e/pnpm_lockfiles

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e2e/pnpm_workspace

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e2e/pnpm_workspace_rerooted

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e2e/repo_mapping

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e2e/rules_foo

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e2e/runfiles

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e2e/vendored_node

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