ci: try using llvm-cov instead of tarpaulin

.github/workflows/coverage.yml

@@ -41,15 +41,17 @@ jobs:
         with:
           key: ${{ matrix.triple.target }}
 
-      - name: Install tarpaulin
+      - name: Install cargo-llvm-cov
         run: |
-          cargo install cargo-tarpaulin
+          rustup component add llvm-tools-preview
+          cargo install cargo-llvm-cov --version 0.3.0
 
       - name: Generate code coverage
         run: |
-          cargo tarpaulin --verbose --all-features --workspace --run-types AllTargets --timeout 120 --out Xml
+          cargo llvm-cov --all-features --workspace --lcov --output-path lcov.info
 
       - name: Upload to codecov.io
         uses: codecov/codecov-action@f32b3a3741e1053eb607407145bc9619351dc93b # 2.1.0
         with:
+          files: lcov.info
           fail_ci_if_error: true