fix: return ParsedTarFileItem type after parsing

[bluwy]

The return type of parseTar and parseTarGzip should be using ParsedTarFileItem as that's what being computed in the functions:

nanotar/src/parse.ts

Lines 3 to 6 in c1247bd

	export function parseTar(data: ArrayBuffer | Uint8Array): TarFileItem[] {
	const buffer = (data as Uint8Array).buffer || data;
	const files: ParsedTarFileItem[] = [];

nanotar/src/parse.ts

Line 75 in c1247bd

return files;