Fix for PHP_CodeSniffer error after app:config:dump

[dng-dev]

Description (*)

After app:config:dump in our CI environment phpcs complains about uppercase constant for "null"
(Generic.PHP.LowerCaseConstant.Found) TRUE, FALSE and NULL must be lowercase; expected "null" but found "NULL" (Generic.PHP.LowerCaseConstant.Found)

The source of this uppercase constant can be found in the [php source].(https://github.com/php/php-src/blob/master/ext/standard/var.c#L486)

Fixed Issues (if relevant)

1. magento/magento2#<issue_number>: Issue title

Manual testing scenarios (*)

1. install magento2
2. excute app:config:dump

Questions or comments

Contribution checklist (*)

• [x ] Pull request has a meaningful description of its purpose
• [x ] All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds are green)

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[magento-cicd2]

All committers have signed the CLA.

[rogyar]

Ideally, you should exclude the config file from static code analysis. But in case if your infrastructure strictly requires checking all incoming PHP files it might be a good catch.

[magento-engcom-team]

Hi @rogyar, thank you for the review.
ENGCOM-5474 has been created to process this Pull Request
✳️ @rogyar, could you please add one of the following labels to the Pull Request?

Label	Description
Auto-Tests: Covered	All changes in Pull Request is covered by auto-tests
Auto-Tests: Not Covered	Changes in Pull Request requires coverage by auto-tests
Auto-Tests: Not Required	Changes in Pull Request does not require coverage by auto-tests

[magento-engcom-team]

@dng-dev thank you for contributing. Please accept Community Contributors team invitation here to gain extended permissions for this repository.

[engcom-Alfa]

✔️ QA Passed

[dng-dev]

@rogyar are the checks hanging?

[rogyar]

Hi @dng-dev. The tests will be executed internally once again, so no worries.

[m2-assistant]

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