TYPO3 Core

`AbstractPlatform::getIdentifierQuoteCharacter()`
is deprecated since Doctrine DBAL 3.7.x and will
be removed with Doctrine DBAL 4.x - with proposing
to use `AbstractPlatform::quoteIdentifier()` to
retrieve it. [1]²

The proposed way to mitigate this depraction looks like

 $quoteChar = (new AbstractPlatform)
   ->quoteSingleIdentifier('fake')[0];

[1] https://github.com/doctrine/dbal/blob/3.7.x/UPGRADE.md#deprecated-abstractplatform-methods-exposing-quote-characters
[2] https://github.com/doctrine/dbal/blob/4.0.x/UPGRADE.md#bc-break-removed-abstractplatform-methods-exposing-quote-characters