Update ghcr.io/alexjustesen/speedtest-tracker Docker tag to v0.18.1

Author: renovate[bot]

utility-services/docker-compose.yaml

@@ -134,7 +134,7 @@ services:
       start_period: 20s
 
   speedtest-tracker:
-    image: ghcr.io/alexjustesen/speedtest-tracker:v0.17.2
+    image: ghcr.io/alexjustesen/speedtest-tracker:v0.18.1
     container_name: speedtest-tracker
     environment:
       PUID: 1000