Bump kastore from 0.2.2 to 0.3.0 in /python/requirements/CI

Bumps [kastore](https://github.com/tskit-dev/kastore) from 0.2.2 to 0.3.0.
- [Release notes](https://github.com/tskit-dev/kastore/releases)
- [Changelog](https://github.com/tskit-dev/kastore/blob/master/docs/changelogs.rst)
- [Commits](tskit-dev/kastore@py_0.2.2...0.3.0)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

python/requirements/CI/requirements.txt

@@ -7,7 +7,7 @@ coverage==5.1
 flake8==3.8.2
 h5py==2.10.0
 jsonschema==3.2.0
-kastore==0.2.2
+kastore==0.3.0
 msgpack==1.0.0
 msprime==0.7.4
 networkx==2.4