Update timeline.json: column Action larger width (#3744)

The Action column is too small. Perhaps due to the new Grafana version? So, I bump the width up

Author: DrMichael

grafana/dashboards/timeline.json

@@ -182,7 +182,7 @@
             "properties": [
               {
                 "id": "custom.width",
-                "value": 100
+                "value": 150
               },
               {
                 "id": "custom.filterable",
@@ -833,4 +833,4 @@
   "uid": "SUBgwtigz",
   "version": 1,
   "weekStart": ""
-}
+}