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MINOR: [C#] Bump Google.Protobuf from 3.27.2 to 3.27.3 in /csharp (#43571)

Bumps [Google.Protobuf](https://github.com/protocolbuffers/protobuf) from 3.27.2 to 3.27.3.
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/protocolbuffers/protobuf/commit/7cc670c1809e704ebeba90fb430d50e009f36727"><code>7cc670c</code></a> Updating version.json and repo version numbers to: 27.3</li>
<li><a href="https://github.com/protocolbuffers/protobuf/commit/67d7298f22d124da7463915aa15fca3c13d8dc65"><code>67d7298</code></a> Merge pull request <a href="https://redirect.github.com/protocolbuffers/protobuf/issues/17617">#17617</a> from protocolbuffers/cp-utf8-ascii</li>
<li><a href="https://github.com/protocolbuffers/protobuf/commit/e20cb7aaf7e6fde6b09fbb3452fffa9fa2c656d1"><code>e20cb7a</code></a> Remove <code>/utf-8</code> flag added in <a href="https://redirect.github.com/protocolbuffers/protobuf/issues/14197">#14197</a></li>
<li><a href="https://github.com/protocolbuffers/protobuf/commit/c9839cb01c88cc47068590209f7020022e5ceb48"><code>c9839cb</code></a> Merge pull request <a href="https://redirect.github.com/protocolbuffers/protobuf/issues/17473">#17473</a> from protocolbuffers/cp-revert-hack</li>
<li><a href="https://github.com/protocolbuffers/protobuf/commit/8a579c1af579c55bdf4fe6da81084ece3597f712"><code>8a579c1</code></a> Downgrade CMake to 3.29 to workaround Abseil issue.</li>
<li><a href="https://github.com/protocolbuffers/protobuf/commit/ba3e7d7a8aea8a9eafebe3407d94b877cf16e362"><code>ba3e7d7</code></a> Revert workaround for std::mutex issues on github windows runners.</li>
<li><a href="https://github.com/protocolbuffers/protobuf/commit/861be784603c699eb0a016d5c5a79a1058278879"><code>861be78</code></a> Merge pull request <a href="https://redirect.github.com/protocolbuffers/protobuf/issues/17331">#17331</a> from protocolbuffers/cp-cp</li>
<li><a href="https://github.com/protocolbuffers/protobuf/commit/c1ec82fe381c196a3930ff620e6aed5ea1e26e1e"><code>c1ec82f</code></a> Merge pull request <a href="https://redirect.github.com/protocolbuffers/protobuf/issues/17232">#17232</a> from simonberger/bugfix/php-ext-persistent-global-c...</li>
<li><a href="https://github.com/protocolbuffers/protobuf/commit/aec8a7604d74a0e8aa14b45b1295984c0acd51f2"><code>aec8a76</code></a> Upgrade macos-11 tests to macos-12</li>
<li><a href="https://github.com/protocolbuffers/protobuf/commit/4e3b4f0819a7187f0c369ba1a7cd1cbca012e28a"><code>4e3b4f0</code></a> Use explicit names of our large runners</li>
<li>Additional commits viewable in <a href="https://github.com/protocolbuffers/protobuf/compare/v3.27.2...v3.27.3">compare view</a></li>
</ul>
</details>
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Authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>