[v9] Remove workaround for `Platform.executable `

[ueman]

Description

Since you've raised the minimal Flutter/Dart versions, you can remove this workaround:

sentry-dart/dart/lib/src/event_processor/enricher/io_enricher_event_processor.dart

Lines 81 to 94 in 08aff50

	try {
	// This throws sometimes for some reason
	// https://github.com/flutter/flutter/issues/83921
	executable = Platform.executable;
	} catch (exception, stackTrace) {
	_options.logger(
	SentryLevel.error,
	'Platform.executable couldn\'t be retrieved.',
	exception: exception,
	stackTrace: stackTrace,
	);
	if (_options.automatedTestMode) {
	rethrow;
	}

flutter/flutter#83921 is no longer happening for the supported versions.