Fixed small typo in README.md

[alexmerlin]

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name: 🐞 Bug Fix
about: There is a small typo in README.md instructing devs to use a GHA with invalid code - this PR fixes it
labels: bug

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Description

In README.md, under the Matrix Setup section there is a line with the following invalid code:

php-versions: [8.2', '8.3', '8.4']

This PR adds the missing single quote:

php-versions: ['8.2', '8.3', '8.4']

In case this PR introduced TypeScript/JavaScript code changes:

• I have written test cases for the changes in this pull request
• I have run npm run format before the commit.
• I have run npm run lint before the commit.
• I have run npm run release before the commit.
• npm test returns with no unit test errors and all code covered.

In case this PR edits any scripts:

• I have checked the edited scripts for syntax.
• I have tested the changes in an integration test (If yes, provide workflow YAML and link).

[shivammathur]

@alexmerlin Thanks!