Restrict kubernetes client library to version 9.x.x

[nolar]

Issue : #134, kubernetes-client/python#866

Description

Restrict kubernetes client library to <10.0.0, as 10.0.0 is broken (both for Kopf and for an isolated example).

A hotfix version kopf==0.17.post1 was released to hot-fix this issue for regular use of Kopf via pip install kopf (0.17 is the latest released version to the moment).

But this same restriction must be in the master branch before the next version is released (i.e. for 0.18).

Types of Changes

• Bug fix (non-breaking change which fixes an issue)

[zincr]

🤖 zincr found 0 problems , 0 warnings

✅ Large Commits
✅ Approvals
✅ Specification
✅ Dependency Licensing

[zincr]

🤖 zincr found 1 problem , 0 warnings

❌ Approvals
✅ Large Commits
✅ Specification
✅ Dependency Licensing

Details on how to resolve are provided below

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Approvals

All proposed changes must be reviewed by project maintainers before they can be merged

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• ✅ Approved by PR author @nolar
• ❌ 1 additional approval needed