Update coverage ci options

Author: khvzak

.github/workflows/coverage.yml

@@ -6,15 +6,15 @@ jobs:
     name: coverage
     runs-on: ubuntu-latest
     container:
-      image: xd009642/tarpaulin
+      image: xd009642/tarpaulin:develop-nightly
       options: --security-opt seccomp=unconfined
     steps:
       - name: Checkout repository
         uses: actions/checkout@main
 
       - name: Generate coverage report
         run: |
-          cargo tarpaulin --out xml --tests --exclude-files benches/* --exclude-files mlua-sys/src/*/*
+          cargo +nightly tarpaulin --verbose --out xml --tests --exclude-files benches/* --exclude-files mlua-sys/src/*/*
 
       - name: Upload report to codecov.io
         uses: codecov/codecov-action@v4