Bump jsonpointer from 2.0 to 2.1

Bumps [jsonpointer](https://github.com/stefankoegl/python-json-pointer) from 2.0 to 2.1.
- [Release notes](https://github.com/stefankoegl/python-json-pointer/releases)
- [Commits](stefankoegl/python-json-pointer@v2.0...v2.1)

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

requirements.txt

@@ -11,7 +11,7 @@ hupper==1.10.2
 idna==3.1
 iso8601==0.1.14
 jsonpatch==1.31
-jsonpointer==2.0
+jsonpointer==2.1
 jsonschema==3.2.0
 kinto==14.2.0
 logging-color-formatter==1.0.2