Updates runner used to run DCO check to use databricks-protected-runner (#521)

* commit 1

Signed-off-by: Madhav Sainanee <madhav.sainanee@databricks.com>

* commit 1

Signed-off-by: Madhav Sainanee <madhav.sainanee@databricks.com>

* updates runner for dco check

Signed-off-by: Madhav Sainanee <madhav.sainanee@databricks.com>

* removes contributing file changes

Signed-off-by: Madhav Sainanee <madhav.sainanee@databricks.com>

---------

Signed-off-by: Madhav Sainanee <madhav.sainanee@databricks.com>

Author: madhav-db

.github/workflows/dco-check.yml

@@ -4,7 +4,9 @@ on: [pull_request]
 
 jobs:
   check:
-    runs-on: ubuntu-latest
+    runs-on:
+        group: databricks-protected-runner-group
+        labels: linux-ubuntu-latest
     steps:
       - name: Check for DCO
         id: dco-check