Update dependency friends-of-phpspec/phpspec-code-coverage to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
friends-of-phpspec/phpspec-code-coverage	require-dev	major	^4.3.2 -> ^6.0.0

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Release Notes

friends-of-phpspec/phpspec-code-coverage

v6.1.0

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• Added support for directory filtering #​44

v6.0.0

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• Support PHP 8
• Extension requires PHP7.3+ (due to phpunit/php-code-coverage v9 depending on it) #​36
  Version 5.x will still be maintained

v5.0.0

Compare Source

• Extension requires PHP7.2+ (due to PhpSpec v7 depending on it) #​37, #​35

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