Remove workaround for use pre-release of .NET 5 RTM build

To use the pre-release version of .NET 5 RTM builds a workaround had to be added to build.psm1

https://github.com/PowerShell/PowerShell/blob/201f4a6b78f9480589bc29cac91b140d1a5583cf/build.psm1#L1775-L1778

Please remove this when .NET 5 is released.

Also,

remove the RTM feed from the nuget.config:

https://github.com/PowerShell/PowerShell/blob/f03952fc3c6e56aad4ebf5636178b1a5c7481fa8/nuget.config#L5

## Steps to reproduce

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## Expected behavior

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## Actual behavior

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Uh oh!

Remove workaround for use pre-release of .NET 5 RTM build #13974

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	# Temporary workaround to consume .NET 5 pre-release RTM build
	if ($Version -eq '5.0.100') {
	$Version = '5.0.100-rtm.20526.5'
	}

Remove workaround for use pre-release of .NET 5 RTM build #13974

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