Bump js from 0.6.7 to 0.7.0 in /web_embedding/ng-flutter/flutter (#2136)

Bumps [js](https://github.com/dart-lang/sdk/tree/main/pkg) from 0.6.7 to
0.7.0.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="dfff7719c2"><code>dfff771</code></a>
Version 0.7.0.0</li>
<li><a
href="df6ae384cc"><code>df6ae38</code></a>
Version 0.6.21.3</li>
<li><a
href="ce57b84db5"><code>ce57b84</code></a>
Version 0.6.21.0</li>
<li><a
href="c2e4ca3466"><code>c2e4ca3</code></a>
svn merge -r 26292:26492 <a
href="https://dart.googlecode.com/svn/branches/bleeding_ed">https://dart.googlecode.com/svn/branches/bleeding_ed</a>...</li>
<li><a
href="0b2b0fe968"><code>0b2b0fe</code></a>
Version 0.6.19.0 .</li>
<li><a
href="2c5963a464"><code>2c5963a</code></a>
Version 0.6.18.0 .</li>
<li><a
href="61f7d41c12"><code>61f7d41</code></a>
Version 0.6.17.0 .</li>
<li><a
href="e97cdf2914"><code>e97cdf2</code></a>
Version 0.6.16.0 .</li>
<li><a
href="c3a1e1a82c"><code>c3a1e1a</code></a>
Version 0.6.15.2 .</li>
<li><a
href="8e602bd629"><code>8e602bd</code></a>
Version 0.6.15.0 .</li>
<li>Additional commits viewable in <a
href="https://github.com/dart-lang/sdk/commits/0.7.0.0/pkg">compare
view</a></li>
</ul>
</details>
<br />


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web_embedding/ng-flutter/flutter/pubspec.yaml

@@ -10,7 +10,7 @@ dependencies:
   cupertino_icons: ^1.0.2
   flutter:
     sdk: flutter
-  js: ^0.6.7
+  js: ^0.7.0
 
 dev_dependencies:
   flutter_test: