[roll] Roll fuchsia [versioning] Delete stray API levels 17 and 21 goldens

https://fxrev.dev/1143178 added these files after
https://fxrev.dev/1140932 was uploaded to retire these API levels and
delete their history directories.

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1150774
Original-Revision: 721029d3e496f33b721f6e4c0ed9388951438bcb
GitOrigin-RevId: 7be114ea05401255191c50fc7ce05c541f59ae51
Change-Id: I11f82e495ff7c27418796dd759e1a25c98584115

Author: David Dorwin

stem

@@ -11,7 +11,7 @@
              githooks="integration/git-hooks"
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="ad3cca254e7ce3122563fef2d23206ea1ea52033"/>
+             revision="721029d3e496f33b721f6e4c0ed9388951438bcb"/>
   </projects>
   <hooks>
     <hook name="install-environment"