Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/c1f933e60841
Author: Guillaume C. Marty <edo999@gmail.com>
Desc: Merge pull request #20229 from gmarty/fix-link

Fix link in tablet README

========

https://hg.mozilla.org/integration/gaia-central/rev/f715a400249f
Author: Guillaume Marty <edo999@gmail.com>
Desc: Fix link in tablet README
Bumping manifests a=b2g-bump