Bump louislam/uptime-kuma from 2.2.0 to 2.2.1 in /docker (#49)

Bumps louislam/uptime-kuma from 2.2.0 to 2.2.1.

---
updated-dependencies:
- dependency-name: louislam/uptime-kuma
  dependency-version: 2.2.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

docker/docker-compose.yml

@@ -293,7 +293,7 @@ services:
       start_period: 30s
 
   uptime_kuma:
-    image: louislam/uptime-kuma:2.2.0
+    image: louislam/uptime-kuma:2.2.1
     container_name: uptime_kuma
     hostname: uptime_kuma
     restart: unless-stopped