fix: increase Uptime Kuma API timeout and fix status code format

- Increase socket timeout from 30s to 120s (121+ monitors need time to sync)
- Add wait_events=0.2 for reliable login
- Fix accepted_statuscodes format: use 100-increment ranges not arbitrary

[ci skip]

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

stacks/uptime-kuma/modules/uptime-kuma/main.tf

@@ -301,7 +301,7 @@ with open(TARGETS_FILE) as f:
 
 print(f"Loaded {len(targets)} external monitor targets")
 
-api = UptimeKumaApi(UPTIME_KUMA_URL, timeout=30)
+api = UptimeKumaApi(UPTIME_KUMA_URL, timeout=120, wait_events=0.2)
 api.login("admin", UPTIME_KUMA_PASS)
 
 monitors = api.get_monitors()
@@ -323,7 +323,7 @@ for t in targets:
             url=t["url"],
             interval=300,
             maxretries=3,
-            accepted_statecodes=["200-499"],
+            accepted_statuscodes=["200-299", "300-399", "400-499"],
         )
         created += 1
         time.sleep(0.3)