Update dependency composer/installers to v2 - autoclosed

This MR contains the following updates:

Package	Type	Update	Change
composer/installers (source)	require	major	1.11.0 -> 2.0.1

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Release Notes

composer/installers

v2.0.1

Compare Source

Fixed

• Fixed installer for Pantheon Quicksilver modules/scripts #​494.

v2.0.0

Compare Source

Added

• Added installer for Pantheon Quicksilver modules/scripts #​492.
• Added installer for Akaunting modules #​489.

Removed

• Removed support for TYPO3 Flow

v1.12.0

Compare Source

Added

• Added installer for Pantheon Quicksilver modules/scripts #​495.

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Configuration

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