update trusted publishing docs to checkout v5 action

Author: marcoieni

app/templates/docs/trusted-publishing.hbs

@@ -77,7 +77,7 @@ jobs:
     permissions:
       id-token: write     # Required for OIDC token exchange
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - uses: rust-lang/crates-io-auth-action@v1
       id: auth
     - run: cargo publish