Update dependency psalm/plugin-phpunit to ^0.19

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
psalm/plugin-phpunit	^0.18 -> ^0.19

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Release Notes

psalm/psalm-plugin-phpunit (psalm/plugin-phpunit)

v0.19.0: Add Psalm 6 support, drop Psalm 4 support

Compare Source

This release adds support for Psalm 6, dropping support for Psalm 4.

What's Changed

• Update README.md by @​sander-bol in https://github.com/psalm/psalm-plugin-phpunit/pull/128
• Replace deprecated ::set-output by @​weirdan in https://github.com/psalm/psalm-plugin-phpunit/pull/132
• Dependabot updates for GH actions by @​weirdan in https://github.com/psalm/psalm-plugin-phpunit/pull/133
• Bump actions/checkout from 2 to 3 by @​dependabot in https://github.com/psalm/psalm-plugin-phpunit/pull/134
• Bump actions/cache from 2 to 3 by @​dependabot in https://github.com/psalm/psalm-plugin-phpunit/pull/135
• Switch to MixedReturnStatement, drop Psalm 4 support by @​danog in https://github.com/psalm/psalm-plugin-phpunit/pull/142

New Contributors

• @​sander-bol made their first contribution in https://github.com/psalm/psalm-plugin-phpunit/pull/128
• @​dependabot made their first contribution in https://github.com/psalm/psalm-plugin-phpunit/pull/134

Full Changelog: psalm/psalm-plugin-phpunit@0.18.4...0.19.0

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