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>

tests/integration/integration_test.go

@@ -246,13 +246,13 @@ func loginUserWithPassword(t testing.TB, userName, password string) *TestSession
 }
 
 // token has to be unique this counter take care of
-var tokenCounter int64
+var tokenCounter atomic.Int64
 
 // getTokenForLoggedInUser returns a token for a logged-in user.
 func getTokenForLoggedInUser(t testing.TB, session *TestSession, scopes ...auth.AccessTokenScope) string {
 	t.Helper()
 	urlValues := url.Values{}
-	urlValues.Add("name", fmt.Sprintf("api-testing-token-%d", atomic.AddInt64(&tokenCounter, 1)))
+	urlValues.Add("name", fmt.Sprintf("api-testing-token-%d", tokenCounter.Add(1)))
 	for _, scope := range scopes {
 		urlValues.Add("scope-dummy", string(scope)) // it only needs to start with "scope-" to be accepted
 	}