types: rename json parts to part_set_header (#5523)

CHANGELOG_PENDING.md

@@ -25,3 +25,5 @@ Friendly reminder, we have a [bug bounty program](https://hackerone.com/tendermi
 - [statesync] \#5516 Check that all heights necessary to rebuild state for a snapshot exist before adding the snapshot to the pool. (@erikgrinaker)
 
 ### BUG FIXES
+
+- [types] \#5523 Change json naming of `PartSetHeader` within `BlockID` from `parts` to `part_set_header` (@marbar3778)

types/block.go

@@ -1150,7 +1150,7 @@ func (data *EvidenceData) FromProto(eviData *tmproto.EvidenceData) error {
 // BlockID
 type BlockID struct {
 	Hash          tmbytes.HexBytes `json:"hash"`
-	PartSetHeader PartSetHeader    `json:"parts"`
+	PartSetHeader PartSetHeader    `json:"part_set_header"`
 }
 
 // Equals returns true if the BlockID matches the given BlockID