Update audit.yml

.github/workflows/audit.yml

@@ -1,11 +1,9 @@
 name: Security audit
 on:
-  push:
-    paths: 
-      - '**/Cargo.toml'
-      - '**/Cargo.lock'
+  schedule:
+    - cron: '0 0 * * *'
 jobs:
-  security_audit:
+  audit:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v1