[gold] Fix typo in json version
[gold] Fix typo in json version

Change-Id: I07f3875b61687b71b5cc8c0b8de7ea74231a85ce
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/279857
Reviewed-by: Leandro Lovisolo <f558143c2568be8d55575d13f30a1fc5cb8009d5@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot