Better normalization of the copyright statements

[ForNeVeR]

See this TODO comment:

dotnet-licenses/scripts/Test-NuGetMetadata.ps1

Lines 27 to 38 in de6e082

	# TODO: This should be performed using the tooling provided by dotnet-authors in the future.
	function normalizeCopyrights($copyrights) {
	$normalized = @()
	foreach ($copyright in $copyrights) {
	if ($copyright -eq '© 2024 Friedrich von Never') {
	$normalized += '2024 Friedrich von Never <friedrich@fornever.me>'
	} else {
	$normalized += $copyright
	}
	}
	return $normalized
	}

For now, this is a quick hack, but in the future my intention will be to have a general tool to work with copyright statements in the form of the dotnet-authors package.