Bump follow-redirects from 1.15.4 to 1.15.6 in /fixtures/concurrent/time-slicing (facebook#28572)

Bumps
[follow-redirects](https://github.com/follow-redirects/follow-redirects)
from 1.15.4 to 1.15.6.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/follow-redirects/follow-redirects/commit/35a517c5861d79dc8bff7db8626013d20b711b06"><code>35a517c</code></a>
Release version 1.15.6 of the npm package.</li>
<li><a
href="https://github.com/follow-redirects/follow-redirects/commit/c4f847f85176991f95ab9c88af63b1294de8649b"><code>c4f847f</code></a>
Drop Proxy-Authorization across hosts.</li>
<li><a
href="https://github.com/follow-redirects/follow-redirects/commit/8526b4a1b2ab3a2e4044299377df623a661caa76"><code>8526b4a</code></a>
Use GitHub for disclosure.</li>
<li><a
href="https://github.com/follow-redirects/follow-redirects/commit/b1677ce00110ee50dc5da576751d39b281fc4944"><code>b1677ce</code></a>
Release version 1.15.5 of the npm package.</li>
<li><a
href="https://github.com/follow-redirects/follow-redirects/commit/d8914f7982403ea096b39bd594a00ee9d3b7e224"><code>d8914f7</code></a>
Preserve fragment in responseUrl.</li>
<li>See full diff in <a
href="https://github.com/follow-redirects/follow-redirects/compare/v1.15.4...v1.15.6">compare
view</a></li>
</ul>
</details>
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fixtures/concurrent/time-slicing/yarn.lock

@@ -3372,9 +3372,9 @@ flatten@^1.0.2:
   integrity sha512-dVsPA/UwQ8+2uoFe5GHtiBMu48dWLTdsuEd7CKGlZlD78r1TTWBvDuFaFGKCo/ZfEr95Uk56vZoX86OsHkUeIg==
 
 follow-redirects@^1.0.0:
-  version "1.15.4"
-  resolved "https://registry.yarnpkg.com/follow-redirects/-/follow-redirects-1.15.4.tgz#cdc7d308bf6493126b17ea2191ea0ccf3e535adf"
-  integrity sha512-Cr4D/5wlrb0z9dgERpUL3LrmPKVDsETIJhaCMeDfuFYcqa5bldGV6wBsAN6X/vxlXQtFBMrXdXxdL8CbDTGniw==
+  version "1.15.6"
+  resolved "https://registry.yarnpkg.com/follow-redirects/-/follow-redirects-1.15.6.tgz#7f815c0cda4249c74ff09e95ef97c23b5fd0399b"
+  integrity sha512-wWN62YITEaOpSK584EZXJafH1AGpO8RVgElfkuXbTOrPX4fIfOyEpW/CsiNd8JdYrAoOvafRTOEnvsO++qCqFA==
 
 for-in@^1.0.1, for-in@^1.0.2:
   version "1.0.2"