fix: store/rootmulti: fix non-deterministic map iteration (#12487)

## Description

This change fixes non-deterministic map iteration over rs.stores from (*Store).buildCommitInfo by instead sorting the keys then iterating over the sorted slice.

Fixes https://github.com/cosmos/cosmos-sdk/issues/12429

---

### Author Checklist

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- [x] included the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [x] added `!` to the type prefix if API or client breaking change
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- [x] followed the guidelines for [building modules](https://github.com/cosmos/cosmos-sdk/blob/main/docs/building-modules)
- [x] included the necessary unit and integration [tests](https://github.com/cosmos/cosmos-sdk/blob/main/CONTRIBUTING.md#testing)
- [x] added a changelog entry to `CHANGELOG.md`
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### Reviewers Checklist

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- [ ] confirmed the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] confirmed `!` in the type prefix if API or client breaking change
- [ ] confirmed all author checklist items have been addressed 
- [ ] reviewed state machine logic
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- [ ] reviewed tests and test coverage
- [ ] manually tested (if applicable)

CHANGELOG.md

@@ -100,6 +100,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 empty coins slice before it is used to create `banktype.MsgSend`.
 * (x/auth/tx) [#12474](https://github.com/cosmos/cosmos-sdk/pull/12474) Remove condition in GetTxsEvent that disallowed multiple equal signs, which would break event queries with base64 strings (i.e. query by signature).
 * [#12448](https://github.com/cosmos/cosmos-sdk/pull/12448) Start telemetry independently from the API server.
+* (store/rootmulti) [#12487](https://github.com/cosmos/cosmos-sdk/pull/12487) Fix non-deterministic map iteration.
 
 ## [v0.46.0-rc1](https://github.com/cosmos/cosmos-sdk/releases/tag/v0.46.0-rc1) - 2022-05-23
 

store/rootmulti/store.go

@@ -907,8 +907,17 @@ func (rs *Store) loadCommitStoreFromParams(key types.StoreKey, id types.CommitID
 }
 
 func (rs *Store) buildCommitInfo(version int64) *types.CommitInfo {
+	keys := make([]types.StoreKey, 0, len(rs.stores))
+	for key := range rs.stores {
+		keys = append(keys, key)
+	}
+	sort.Slice(keys, func(i, j int) bool {
+		return keys[i].Name() < keys[j].Name()
+	})
+
 	storeInfos := []types.StoreInfo{}
-	for key, store := range rs.stores {
+	for _, key := range keys {
+		store := rs.stores[key]
 		if store.GetStoreType() == types.StoreTypeTransient {
 			continue
 		}