github: workflows: Fix compliance job name

Don't use "build" since it becomes difficult to distinguish this from the
actual build workflows when defining rule sets for the repo.

Signed-off-by: Johan Hedberg <johan.hedberg@silabs.com>

Author: jhedberg

.github/workflows/compliance.yml

@@ -9,7 +9,7 @@ on:
     - synchronize
 
 jobs:
-  build:
+  compliance:
     runs-on: ubuntu-22.04
     steps:
     - name: Checkout