Bump kinto from 14.2.0 to 14.3.0

Bumps [kinto](https://github.com/Kinto/kinto) from 14.2.0 to 14.3.0.
- [Release notes](https://github.com/Kinto/kinto/releases)
- [Changelog](https://github.com/Kinto/kinto/blob/master/CHANGELOG.rst)
- [Commits](Kinto/kinto@14.2.0...14.3.0)

---
updated-dependencies:
- dependency-name: kinto
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -13,7 +13,7 @@ iso8601==0.1.14
 jsonpatch==1.32
 jsonpointer==2.1
 jsonschema==3.2.0
-kinto==14.2.0
+kinto==14.3.0
 logging-color-formatter==1.0.2
 PasteDeploy==2.1.1
 plaster==1.0