Update to CodeCov @v5 (#608)

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V5 seems to resolve a number of issues, include [this
one](codecov/codecov-action#1580) which
happens in our repo [for
sure](https://github.com/delta-io/delta-kernel-rs/actions/runs/12403987305/job/34628440507?pr=607).

This just updates to that.

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.github/workflows/build.yml

@@ -227,7 +227,7 @@ jobs:
       - name: Generate code coverage
         run: cargo llvm-cov --all-features --workspace --codecov --output-path codecov.json -- --skip read_table_version_hdfs
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v4
+        uses: codecov/codecov-action@v5
         with:
           files: codecov.json
           fail_ci_if_error: true