bump xeus-cling in tests
so we don't have an old env relying on the free channel
MODIFY
tests/external/reproductions.repos.yaml
tests/external/reproductions.repos.yaml
# get blocked by pinning
- name: Xeus-Cling
url: https://github.com/QuantStack/xeus-cling
- ref: 0.4.5
+ ref: 0.6.0
verify: jupyter kernelspec list
# Zenodo record of https://github.com/binder-examples/requirements
- name: 10.5281/zenodo.3242074

bump xeus-cling in tests

so we don't have an old env relying on the free channel