Update golangci-lint to v2.11.4 (#37059)

Update golangci-lint from v2.11.2 to v2.11.4 and fix new `modernize`
lint warnings:

- Use `strings.Builder` instead of string concatenation in loop
(`evaluator.go`)
- Use `atomic.Int64` instead of `int64` with atomic free functions
(`logchecker.go`, `timer_test.go`, `integration_test.go`)

---
This PR was written with the help of Claude Opus 4.6

Co-authored-by: Claude (Opus 4.6) <noreply@anthropic.com>

modules/test/logchecker.go

@@ -53,11 +53,11 @@ func (lc *LogChecker) checkLogEvent(event *log.EventFormatted) {
 	}
 }
 
-var checkerIndex int64
+var checkerIndex atomic.Int64
 
 func NewLogChecker(namePrefix string) (logChecker *LogChecker, cancel func()) {
 	logger := log.GetManager().GetLogger(namePrefix)
-	newCheckerIndex := atomic.AddInt64(&checkerIndex, 1)
+	newCheckerIndex := checkerIndex.Add(1)
 	writerName := namePrefix + "-" + strconv.FormatInt(newCheckerIndex, 10)
 
 	lc := &LogChecker{}