ci: fix release-plz workflow

Author: beeb

.github/workflows/release-plz.yml

@@ -14,6 +14,7 @@ jobs:
   release-plz-release:
     name: Release-plz release
     runs-on: ubuntu-latest
+    environment: Cargo
     permissions:
       contents: write
     steps:
@@ -41,6 +42,7 @@ jobs:
   release-plz-pr:
     name: Release-plz PR
     runs-on: ubuntu-latest
+    environment: Cargo
     permissions:
       contents: write
       pull-requests: write