[enhancement] reduce Github Actions runner loading by setting concurrencies (uxlfoundation#2077)

* Update pr-checklist.yml

* Update renovate-validation.yml

Author: icfaust

.github/workflows/pr-checklist.yml

@@ -20,6 +20,10 @@ on:
   pull_request:
     types: [opened, edited, synchronize]
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event_name }}-${{ github.ref_name }}-${{ github.event.number || github.sha }}
+  cancel-in-progress: true
+
 jobs:
   checklist:
     name: Close all checkboxes before moving from draft

.github/workflows/renovate-validation.yml

@@ -17,6 +17,10 @@ on:
 permissions:
   contents: read
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event_name }}-${{ github.ref_name }}-${{ github.event.number || github.sha }}
+  cancel-in-progress: true
+
 jobs:
   validate:
     name: Renovate validation