feature: use +100 staging bit for taproot channels

In this commit, we carry out a new notion introduced during a recent
spec meeting to use a feature bit plus 100 before the feature has been
finalized in the spec.

We split into the Final and Staging bits.

feature/deps.go

@@ -75,7 +75,7 @@ var deps = depDesc{
 	lnwire.ZeroConfOptional: {
 		lnwire.ScidAliasOptional: {},
 	},
-	lnwire.SimpleTaprootChannelsOptional: {
+	lnwire.SimpleTaprootChannelsOptionalStaging: {
 		lnwire.AnchorsZeroFeeHtlcTxOptional: {},
 		lnwire.ExplicitChannelTypeOptional:  {},
 	},