Force node v20 in the workflows

Author: ivarnakken

.upptimerc.yml

@@ -1,6 +1,7 @@
 owner: webkom
 repo: uptime
 
+workflowsSource: workflows
 workflowSchedule:
   graphs: "0 0 * * *"
   responseTime: "0 23 * * *"
@@ -10,7 +11,10 @@ workflowSchedule:
   updates: "0 3 * * *"
   uptime: "*/5 * * * *"
 
-workflowVersion: master
+workflowSetup:
+  - uses: actions/setup-node@v3
+    with:
+      node-version: 20
 
 sites:
   - name: Abakus.no