Implicitly marking a parameter as nullable is deprecated since PHP 8.4.

Problem/Motivation

FILE: /modules/contrib/styleswitcher/src/Form/StyleswitcherStyleDeleteForm.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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 67 | WARNING | Implicitly marking a parameter as nullable is deprecated since PHP 8.4. Update the type to be explicitly nullable instead. Found implicitly nullable parameter: $style.
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FILE: /modules/contrib/styleswitcher/tests/src/Functional/AssertTrait.php
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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 50 | WARNING | Implicitly marking a parameter as nullable is deprecated since PHP 8.4. Update the type to be explicitly nullable instead. Found implicitly nullable parameter: $theme.