chore: run go modernize tool

This is a fixup of the codebase using:
go run golang.org/x/tools/go/analysis/passes/modernize/cmd/modernize@latest -fix ./...

This has no bahvior changes, and only updates safe changes for
modern go features.

tests/rest_scripts/command/payloadChunked.go

@@ -22,12 +22,7 @@ func (c *PayloadChunked) getChunkedPayloadContentLength(additionalChunkHeaderSiz
 	var sizeIdx int64
 	var contentLength int64
 	for sizeIdx = 0; sizeIdx < payloadSize; sizeIdx += c.chunkSize {
-		var endIdx int64
-		if sizeIdx+c.chunkSize < payloadSize {
-			endIdx = sizeIdx + c.chunkSize
-		} else {
-			endIdx = payloadSize
-		}
+		endIdx := min(sizeIdx+c.chunkSize, payloadSize)
 		hexSize := fmt.Sprintf("%x", endIdx-sizeIdx)
 		contentLength += int64(len(hexSize)) + additionalChunkHeaderSize + (endIdx - sizeIdx) + 2
 	}

tests/rest_scripts/command/putBucketCorsCommand.go

@@ -56,8 +56,8 @@ func NewPutBucketCORSCommand(command *S3Command, ruleStrings []string) (*S3Comma
 
 func assembleCORSRule(ruleString string) (*CORSRule, error) {
 	corsRule := &CORSRule{}
-	ruleComponents := strings.Split(ruleString, ";")
-	for _, component := range ruleComponents {
+	ruleComponents := strings.SplitSeq(ruleString, ";")
+	for component := range ruleComponents {
 		componentSegments := strings.Split(component, "=")
 		switch componentSegments[0] {
 		case AllowedMethods: