Using a string as the assertion passed to assert() is deprecated since PHP 7.2 [#3535973]

Problem/Motivation

phpcs detects

FILE: /var/www/html/web/modules/contrib/jsonapi_schema/src/Controller/JsonApiSchemaController.php
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FOUND 1 ERROR AFFECTING 1 LINE
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 215 | ERROR | Using a string as the assertion passed to assert() is deprecated since PHP 7.2 and removed since PHP 8.0. Found: 'not implemented'
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Issue fork jsonapi_schema-3535973

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3535973-using-a-string changes, plain diff MR !23
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