fix: lower amount of cached timezones for deployment daus (#11196)

Updates https://github.com/coder/customers/issues/384

This should help alleviate some pressure, but doesn't really fix the
root cause. See above issue for more details.

codersdk/deployment.go

@@ -1630,7 +1630,7 @@ when required by your organization's security policy.`,
 			Flag:        "metrics-cache-refresh-interval",
 			Env:         "CODER_METRICS_CACHE_REFRESH_INTERVAL",
 			Hidden:      true,
-			Default:     time.Hour.String(),
+			Default:     (4 * time.Hour).String(),
 			Value:       &c.MetricsCacheRefreshInterval,
 			Annotations: clibase.Annotations{}.Mark(annotationFormatDuration, "true"),
 		},