move signing to lvl3

Author: wurstbrot

src/assets/YAML/default/BuildAndDeployment/Build.yaml

@@ -173,7 +173,7 @@ Build and Deployment:
         time: 2
         resources: 2
       usefulness: 3
-      level: 4
+      level: 3
       implementation:
       - $ref: src/assets/YAML/default/implementations.yaml#/implementations/signing-of-commits
       - $ref: src/assets/YAML/default/implementations.yaml#/implementations/signing-of-commits-protection