Allow users to switch to native tool versions on demand

[yeikel]

Is there an existing issue for this?

• I have searched the existing issues

Feature description

Dependabot currently comes with fixed versions of native tools, such as npm:

dependabot-core/npm_and_yarn/Dockerfile

Lines 9 to 24 in c18cade

	ARG PNPM_VERSION=10.16.0
	# Check for updates at https://github.com/yarnpkg/berry/releases
	# With every major release update, also update npm_and_yarn/lib/dependabot/npm_and_yarn/yarn_package_manager.rb (Section : Update instructions)
	ARG YARN_VERSION=4.9.2
	# See https://github.com/nodesource/distributions#installation-instructions
	# Always update NODEJS_VERSION with a compatible NPM_VERSION
	# See https://nodejs.org/en/about/previous-releases#looking-for-the-latest-release-of-a-version-branch for more information
	# Note : Always use the Active LTS version
	ARG NODEJS_VERSION=24
	# Check for updates at https://github.com/npm/cli/releases
	# This version should be compatible with the NODEJS_VERSION version declared above. See https://nodejs.org/en/download/releases as well
	# With every major release update, also update npm_and_yarn/lib/dependabot/npm_and_yarn/npm_package_manager.rb (Section : Update instructions)
	ARG NPM_VERSION=11.7.0

This approach generally works, but when a user specifies a particular version, Dependabot still relies on the pre-installed tool, disregarding preferences set through the engine field, .nvmrc, or similar configuration files. Relying on the global binary means using the latest installed version, which usually works, but occasionally a new release introduces a bug, fix, or breaking change that can affect how your project is installed.

Ideally, Dependabot should respect these configurations and install or switch to the requested version as needed.

Additional context

The initial logic for this was introduced in #13607, but it only supports switching at the major version level.

As highlighted in issues like #13931, there is a need for more granular control over tool versions.