*: Empty maps using built-in clear function

It is available starting from Go 1.21.

Signed-off-by: Leonard Lyubich <[email protected]>

deploy/alphabet.go

@@ -151,9 +151,7 @@ mainLoop:
 			continue
 		}
 
-		for k := range mRegisteredAlphabetIndices {
-			delete(mRegisteredAlphabetIndices, k)
-		}
+		clear(mRegisteredAlphabetIndices)
 
 		for {
 			candidates, err := iterCandidates.Next(len(alphabet) - len(mRegisteredAlphabetIndices))

deploy/notary.go

@@ -212,9 +212,7 @@ func initDesignateNotaryRoleAsLeaderTick(ctx context.Context, prm enableNotaryPr
 
 	resetTx := func() {
 		tx = nil
-		for k := range mCommitteeIndexToSignature {
-			delete(mCommitteeIndexToSignature, k)
-		}
+		clear(mCommitteeIndexToSignature)
 		txFullySigned = false
 		setDomainRecordTxMonitor.reset()
 		designateRoleTxMonitor.reset()

tests/dump/reader.go

@@ -80,9 +80,7 @@ func (x *Reader) fromDumpStreams(rContracts, rStorageItems io.Reader) error {
 	_csv.ReuseRecord = true
 
 	if x.mStorage != nil {
-		for k := range x.mStorage {
-			delete(x.mStorage, k)
-		}
+		clear(x.mStorage)
 	} else {
 		x.mStorage = make(map[string][]kv)
 	}