Update PHPStan packages to v2 (major)

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
phpstan/phpstan	^1.0 -> ^2.0
phpstan/phpstan-phpunit	^1.0 -> ^2.0
phpstan/phpstan-strict-rules	^1.0 -> ^2.0

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Release Notes

phpstan/phpstan (phpstan/phpstan)

v2.0.1

Compare Source

v2.0.0

Compare Source

phpstan/phpstan-phpunit (phpstan/phpstan-phpunit)

v2.0.1

Compare Source

• 4b6ad7f - Fix
• bec49ea - Merge branch '1.4.x' into 2.0.x
• 3cc8554 - Fixes after PHPStan update
• 09e2d3b - Uncover everything behind the bleedingEdge flag
• 4d861e0 - Fix after TypeSpecifier BC break
• 3faa605 - Update build-cs
• 953195d - Stop testing PHP 7.2 and 7.3
• 7f1457f - Open 2.0.x

v2.0.0

Compare Source

• 3cc8554 - Fixes after PHPStan update
• 09e2d3b - Uncover everything behind the bleedingEdge flag
• 4d861e0 - Fix after TypeSpecifier BC break
• 3faa605 - Update build-cs
• 953195d - Stop testing PHP 7.2 and 7.3
• 7f1457f - Open 2.0.x
• 146d9c3 - Test newer PHP versions
• bb6bec0 - Pin build-cs

phpstan/phpstan-strict-rules (phpstan/phpstan-strict-rules)

v2.0.0

Compare Source

• a4a6a08 - Remove dead test because of raised min-php version
• b60bffc - Fix
• 5d50bde - Fix
• 0368403 - Fix
• 1721dbf - Fix after PHPStan update
• e208c93 - Fix after PHPStan update
• 63956f7 - Moved illegalConstructorMethodCall rules from phpstan to phpstan-strict-rules
• ad53bd9 - Remove options removed in PHPStan 2.0
• 914b5e3 - Everything from Bleeding Edge enabled
• 988fab9 - Add more separate rule toggles
• e227ffd - Merge remote-tracking branch 'origin/1.6.x' into 2.0.x
• 90006f2 - Merge branch '1.6.x' into 2.0.x
• 1062d48 - Fix
• 5eec39f - Set polluteScopeWithBlock to false
• 8e2c8b0 - Fix deprecations
• 1ccec91 - Remove unnecessary dependency on nikic/php-parser
• f8092f9 - Update build-cs
• f647999 - Stop testing PHP 7.2 and 7.3
• f6fb84e - Open 2.0.x

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