Update dependency composer/composer to ^2.6.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
composer/composer (source)	^2.6.5 -> ^2.6.6

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Release Notes

composer/composer (composer/composer)

v2.6.6

Compare Source

• Fixed symfony/console requirement to exclude 7.x as Composer 2.6 is not compatible, 2.7 will be (#​11741)
  • Fixed libpq parsing to use the global constant if available (#​11684)
  • Fixed error output when updating with a temporary constraint fails (#​11692)

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