Revert "build(deps): bump codecov/codecov-action from 3 to 4"

This reverts commit 85284b2.

The tagging of codecov/codecov-action@v4 was premature:
codecov/codecov-action#1089
Wait until v4 is out of beta to upgrade.

Signed-off-by: Kevin Locke <kevin@kevinlocke.name>

.github/workflows/node.js.yml

@@ -54,7 +54,7 @@ jobs:
     - name: Run tests
       run: npm run test-unit-cov
     - name: Upload coverage to Codecov
-      uses: codecov/codecov-action@v4
+      uses: codecov/codecov-action@v3
     - name: Upload coverage to Coveralls
       uses: coverallsapp/github-action@v2
       # Ignore intermittent server errors (which are out of our control).