Update psalm/plugin-phpunit requirement from ^0.18 to ^0.18 || ^0.19

[dependabot[bot]]

Updates the requirements on psalm/plugin-phpunit to permit the latest version.

Release notes

Sourced from psalm/plugin-phpunit's releases.

Add Psalm 6 support, drop Psalm 4 support

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

What's Changed

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

New Contributors

• @​sander-bol made their first contribution in psalm/psalm-plugin-phpunit#128
• @​dependabot made their first contribution in psalm/psalm-plugin-phpunit#134

Full Changelog: https://github.com/psalm/psalm-plugin-phpunit/compare/0.18.4...0.19.0

Commits

• e344eaa Merge pull request #142 from nicelocal/master
• 455d96a Hotfix ordering
• 8b6465d Fixup
• 9732c24 Fixup
• 0b108f9 Fixup
• 69d2c9b Bump
• d024ab2 Switch to MixedReturnStatement
• ad94880 Merge pull request #135 from psalm/dependabot/github_actions/actions/cache-3
• 2405edf Merge pull request #134 from psalm/dependabot/github_actions/actions/checkout-3
• 4578a85 Bump actions/cache from 2 to 3
• Additional commits viewable in compare view

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