Pass $data param as an array to addWarning()

[renventura]

Quite a long time ago (9 years!), it appears the WP sniffs were copied over directly so to avoid a dependency. One of those sniffs is incompatible with PHP 8 - it throws a fatal error that looks like:

PHP Fatal error:  Uncaught TypeError: vsprintf(): Argument #2 ($values) must be of type array, string given in /home/runner/work/plugin-framework/plugin-framework/vendor/squizlabs/php_codesniffer/src/Files/File.php:1084
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Stack trace:
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#0 /home/runner/work/plugin-framework/plugin-framework/vendor/squizlabs/php_codesniffer/src/Files/File.php(1084): vsprintf()
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#1 /home/runner/work/plugin-framework/plugin-framework/vendor/squizlabs/php_codesniffer/src/Files/File.php(734): PHP_CodeSniffer\Files\File->addMessage()
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#2 /home/runner/work/plugin-framework/plugin-framework/vendor/stellarwp/coding-standards/StellarWP/Sniffs/XSS/EscapeOutputSniff.php(323): PHP_CodeSniffer\Files\File->addWarning()
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#3 /home/runner/work/plugin-framework/plugin-framework/vendor/squizlabs/php_codesniffer/src/Files/File.php(518): StellarWP\Sniffs\XSS\EscapeOutputSniff->process()
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#4 /home/runner/work/plugin-framework/plugin-framework/vendor/squizlabs/php_codesniffer/src/Files/LocalFile.php(130): PHP_CodeSniffer\Files\File->process()
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#5 /home/runner/work/plugin-framework/plugin-framework/vendor/squizlabs/php_codesniffer/src/Runner.php(632): PHP_CodeSniffer\Files\LocalFile->process()
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#6 /home/runner/work/plugin-framework/plugin-framework/vendor/squizlabs/php_codesniffer/src/Runner.php(504): PHP_CodeSniffer\Runner->processFile()
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#7 /home/runner/work/plugin-framework/plugin-framework/vendor/squizlabs/php_codesniffer/src/Runner.php(116): PHP_CodeSniffer\Runner->run()
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#8 /home/runner/work/plugin-framework/plugin-framework/vendor/squizlabs/php_codesniffer/bin/phpcs(18): PHP_CodeSniffer\Runner->runPHPCS()
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#9 /home/runner/work/plugin-framework/plugin-framework/vendor/bin/phpcs(119): include('...')
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#10 {main}
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  thrown in /home/runner/work/plugin-framework/plugin-framework/vendor/squizlabs/php_codesniffer/src/Files/File.php on line 1084

This change updates the incompatible code to pass the appropriate argument as an array. See WordPress/WordPress-Coding-Standards@7cd46be for the equivalent fix in the WPCS library.