build(deps-dev): update phpstan/extension-installer requirement from 1.3.1 to 1.4.3

[dependabot[bot]]

Updates the requirements on phpstan/extension-installer to permit the latest version.

Release notes

Sourced from phpstan/extension-installer's releases.

1.4.3

• 85e90b3 - Allow PHPStan ^2.0 (currently in development)

Commits

• 85e90b3 Allow PHPStan ^2.0 (currently in development)
• 46c8219 Add keywords
• f6b87fa Test more Composer versions
• 4ce4d5c Revert "Bump composer-plugin-api"
• 5b19a72 Fix
• bf14f4a Skip zero/inf bounds
• 2586069 Convert constraints into strings consistently
• aae3978 Dump PHPStan version constraint for each package
• bfd401b Fix CI
• 7e654f8 Fix
• Additional commits viewable in compare view

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