fix: add missing UnmarshalCBOR function for protocol param updates

ledger/allegra/pparams.go

@@ -29,3 +29,7 @@ func (p *AllegraProtocolParameters) Update(paramUpdate *AllegraProtocolParameter
 type AllegraProtocolParameterUpdate struct {
 	shelley.ShelleyProtocolParameterUpdate
 }
+
+func (u *AllegraProtocolParameterUpdate) UnmarshalCBOR(data []byte) error {
+	return u.UnmarshalCbor(data, u)
+}

ledger/alonzo/alonzo.go

@@ -513,6 +513,10 @@ type AlonzoProtocolParameterUpdate struct {
 	MaxCollateralInputs  uint            `cbor:"24,keyasint"`
 }
 
+func (u *AlonzoProtocolParameterUpdate) UnmarshalCBOR(data []byte) error {
+	return u.UnmarshalCbor(data, u)
+}
+
 func NewAlonzoBlockFromCbor(data []byte) (*AlonzoBlock, error) {
 	var alonzoBlock AlonzoBlock
 	if _, err := cbor.Decode(data, &alonzoBlock); err != nil {

ledger/conway/conway.go

@@ -279,6 +279,10 @@ type ConwayProtocolParameterUpdate struct {
 	MinFeeRefScriptCostPerByte *cbor.Rat            `cbor:"33,keyasint"`
 }
 
+func (u *ConwayProtocolParameterUpdate) UnmarshalCBOR(data []byte) error {
+	return u.UnmarshalCbor(data, u)
+}
+
 type PoolVotingThresholds struct {
 	cbor.StructAsArray
 	MotionNoConfidence                       cbor.Rat

ledger/mary/pparams.go

@@ -29,3 +29,7 @@ func (p *MaryProtocolParameters) Update(paramUpdate *MaryProtocolParameterUpdate
 type MaryProtocolParameterUpdate struct {
 	allegra.AllegraProtocolParameterUpdate
 }
+
+func (u *MaryProtocolParameterUpdate) UnmarshalCBOR(data []byte) error {
+	return u.UnmarshalCbor(data, u)
+}