fix: ci deny job

Signed-off-by: Jeremy HERGAULT <jeremy.hergault@worldline.com>

.github/workflows/ci.yml

@@ -4,6 +4,8 @@ name: Rust
 # yamllint disable-line rule:truthy
 on:
   push:
+    branches:
+      - main
   pull_request:
   workflow_dispatch:
   schedule: [cron: "40 1 * * *"]
@@ -46,9 +48,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: dtolnay/rust-toolchain@master
+      - uses: dtolnay/rust-toolchain@nightly
         with:
-          toolchain: stable
           components: deny
       - run: cargo deny check