Update dependency composer/installers to v2.0.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
composer/installers (source)	require	patch	2.0.0 -> 2.0.1

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Release Notes

composer/installers

### [`v2.0.1`](https://togithub.com/composer/installers/blob/master/CHANGELOG.md#v201---2021-09-13) [Compare Source](https://togithub.com/composer/installers/compare/v2.0.0...v2.0.1) ##### Fixed - Fixed installer for Pantheon Quicksilver modules/scripts [#​494](https://togithub.com/composer/installers/pull/494).

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