Remove deprecated JSON5 fallback when reading JSONC

[jamietanna]

In

renovate/lib/util/common.ts

Lines 124 to 142 in 5149393

	export function parseJsonWithFallback(
	content: string,
	context: string,
	): JsonValue {
	let parsedJson: JsonValue;
	try {
	parsedJson = parseJsonc(content);
	} catch {
	// warn if json5 format used in json
	parsedJson = JSON5.parse(content);
	logger.warn(
	{ context },
	'File contents are invalid JSONC but parse using JSON5. Support for this will be removed in a future release so please change to a support .json5 file name or ensure correct JSON syntax.',
	);
	}
	return parsedJson;
	}

we currently provide this fallback, but want to remove it.

(Currently for v45, but likely in a future release)