Update codecov/codecov-action action to v7 (#594)

Author: nextest-bot

.github/workflows/coverage.yml

@@ -36,7 +36,7 @@ jobs:
           cargo llvm-cov --no-report --doc
           cargo llvm-cov report --doctests --lcov --output-path lcov.info
       - name: Upload coverage data to codecov
-        uses: codecov/codecov-action@b9fd7d16f6d7d1b5d2bec1a2887e65ceed900238 # v4
+        uses: codecov/codecov-action@fb8b3582c8e4def4969c97caa2f19720cb33a72f # v7
         env:
           CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
         with: