Bump codecov/codecov-action from 3.1.5 to 3.1.6 (#142553)

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 3.1.5 to 3.1.6.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/codecov/codecov-action/releases">codecov/codecov-action's releases</a>.</em></p>
<blockquote>
<h2>v3.1.6</h2>
<p><strong>Full Changelog</strong>: <a href="https://github.com/codecov/codecov-action/compare/v3.1.5...v3.1.6">https://github.com/codecov/codecov-action/compare/v3.1.5...v3.1.6</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/codecov/codecov-action/commit/ab904c41d6ece82784817410c45d8b8c02684457"><code>ab904c4</code></a> chore(release): bump to 3.1.6</li>
<li><a href="https://github.com/codecov/codecov-action/commit/a8c374ae465f56cbb2da206950e903ad74b01bff"><code>a8c374a</code></a> Revert &quot;action.yml: Update to Node.js 20 (<a href="https://redirect.github.com/codecov/codecov-action/issues/1228">#1228</a>)&quot;</li>
<li>See full diff in <a href="https://github.com/codecov/codecov-action/compare/4fe8c5f003fae66aa5ebb77cfd3e7bfbbda0b6b0...ab904c41d6ece82784817410c45d8b8c02684457">compare view</a></li>
</ul>
</details>
<br />

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</details>

.github/workflows/coverage.yml

@@ -23,7 +23,7 @@ jobs:
       - name: ./bin/flutter test --coverage
         run: pushd packages/flutter;../../bin/flutter test --coverage -j 1;popd
       - name: upload coverage
-        uses: codecov/codecov-action@4fe8c5f003fae66aa5ebb77cfd3e7bfbbda0b6b0
+        uses: codecov/codecov-action@ab904c41d6ece82784817410c45d8b8c02684457
         with:
           files: packages/flutter/coverage/lcov.info
           verbose: true