Update lint_master.yml

ubuntu 18.04 is not supported

Author: mosfet80

.github/workflows/lint_master.yml

@@ -6,11 +6,11 @@ on:
 
 jobs:
   axivion:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
 
     steps:
       - name : Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Trigger pipeline
         env: