Update phpstan/phpstan composer dependency to v1.x

[andrewbess]

Currently Magento depends on
"phpstan/phpstan": "^0.12.77",

AC:

• upgrade constrain in composer.json to install "phpstan/phpstan"  v1.x.x
• make related changes in dev/tests if needed
• verify with PHP7.4 and PHP8.0 (manual & automated tests)

[m2-assistant]

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