Configure concurrency to cancel "In progress" actions (openremote#1966)

The styfle/cancel-workflow-action is no longer necessary to accomplish this nowadays.
See: https://github.com/styfle/cancel-workflow-action

Author: wborn

.github/workflows/ci_cd.yml

@@ -90,19 +90,17 @@ on:
         SECRETS:
           required: false
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
 
   build:
     name: CI/CD
     runs-on: ubuntu-latest
 
     steps:
-
-      - name: Cancel previous runs
-        uses: styfle/cancel-workflow-action@85880fa0301c86cca9da44039ee3bb12d3bedbfa # 0.12.1
-        with:
-          access_token: ${{ github.token }}
-
       - name: Get inputs and secrets
         id: inputs-and-secrets
         shell: python