Bump games_services from 3.0.3 to 4.0.0 in /game_template (#2078)

Bumps [games_services](https://github.com/Abedalkareem/games_services)
from 3.0.3 to 4.0.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/Abedalkareem/games_services/releases">games_services's
releases</a>.</em></p>
<blockquote>
<h2>4.0.0 🎁</h2>
<ul>
<li>migrate to Google Play Games Services 2.0.0.</li>
<li>use the Darwin folder for iOS and macOS.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="a6c6135f38"><code>a6c6135</code></a>
update the read me, update version number</li>
<li><a
href="30b203a0d5"><code>30b203a</code></a>
Merge pull request <a
href="https://redirect.github.com/Abedalkareem/games_services/issues/125">#125</a>
from Abedalkareem/feature/move_ios_macos_to_darwin</li>
<li><a
href="815dd4ab95"><code>815dd4a</code></a>
move the ios and macos code to darwin folder</li>
<li><a
href="ab07bbd3e4"><code>ab07bbd</code></a>
Merge pull request <a
href="https://redirect.github.com/Abedalkareem/games_services/issues/123">#123</a>
from theLee3/clean-up-doc-comments</li>
<li><a
href="a0be2adbde"><code>a0be2ad</code></a>
Update docs for version 4.0.0.</li>
<li><a
href="257b49b3c3"><code>257b49b</code></a>
Merge pull request <a
href="https://redirect.github.com/Abedalkareem/games_services/issues/122">#122</a>
from theLee3/finish-v2-migration</li>
<li><a
href="242cb068ff"><code>242cb06</code></a>
Finish migration to Play Games Services v2.</li>
<li><a
href="7f149412a0"><code>7f14941</code></a>
Merge pull request <a
href="https://redirect.github.com/Abedalkareem/games_services/issues/119">#119</a>
from Abedalkareem/feature/update_to_games_services_v2</li>
<li><a
href="4245e3d4e2"><code>4245e3d</code></a>
set the pendingOperation before auth starts for signInV2</li>
<li><a
href="66286c6c75"><code>66286c6</code></a>
Merge pull request <a
href="https://redirect.github.com/Abedalkareem/games_services/issues/120">#120</a>
from domesticmouse/patch-1</li>
<li>Additional commits viewable in <a
href="https://github.com/Abedalkareem/games_services/compare/3.0.3...4.0.0">compare
view</a></li>
</ul>
</details>
<br />


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game_template/pubspec.yaml

@@ -25,7 +25,7 @@ dependencies:
   # that references the dependency.
   firebase_core: ^2.1.1  # Needed for Crashlytics below
   firebase_crashlytics: ^3.3.5  # Error reporting
-  games_services: ^3.0.0  # Achievements and leaderboards
+  games_services: ^4.0.0  # Achievements and leaderboards
   google_mobile_ads: ^3.0.0  # Ads
   in_app_purchase: ^3.0.1  # In-app purchases