[TASK] Update phpstan/phpstan-deprecation-rules requirement from ^1.1 to ^1.2

[dependabot[bot]]

Updates the requirements on phpstan/phpstan-deprecation-rules to permit the latest version.

Release notes

Sourced from phpstan/phpstan-deprecation-rules's releases.

1.2.0

• fa8cce7 - Update lock-closed-issues.yml
• 8342041 - Merge remote-tracking branch 'origin/1.1.x' into 1.2.x
• d457b73 - Update PHPStan version
• ff4f00f - Update FetchingDeprecatedConstRuleTest.php
• 437ac71 - Fix build
• e9ea332 - Update metcalfc/changelog-generator action to v4.3.1
• f71dbf6 - Update cbrgm/mastodon-github-action action to v2
• 10f0e35 - Merge branch '1.1.x' into 1.2.x
• 674d785 - Fix build
• e7fe22b - Update metcalfc/changelog-generator action to v4.2.0
• 83345f7 - Update dessant/lock-threads action to v5
• 788ea1b - remove phpstan/phpstan-php-parser
• 4175e8a - Update actions/checkout action to v4
• f1cacde - Fix a typo
• 1884f9f - Next-gen coding standard workflow
• 2313a63 - Modernize rules to use RuleErrorBuilder and report error identifiers
• ca9e4fd - Open 1.2.x-dev

Commits

• fa8cce7 Update lock-closed-issues.yml
• 8342041 Merge remote-tracking branch 'origin/1.1.x' into 1.2.x
• d457b73 Update PHPStan version
• ff4f00f Update FetchingDeprecatedConstRuleTest.php
• 437ac71 Fix build
• e9ea332 Update metcalfc/changelog-generator action to v4.3.1
• f71dbf6 Update cbrgm/mastodon-github-action action to v2
• 10f0e35 Merge branch '1.1.x' into 1.2.x
• 674d785 Fix build
• e7fe22b Update metcalfc/changelog-generator action to v4.2.0
• Additional commits viewable in compare view

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