chore: Upgrade actions-setup-minikube to v2.0.1

[manusa]

Upgrade manusa/actions-setup-minikube to the latest version.

Also added the optional github token input configuration to prevent GitHub API usage restrictions.

Removes the following warnings caused by CVE-2020-15228:

Warning: The `set-env` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2020-10-01-github-actions-deprecating-set-env-and-add-path-commands/
Warning: The `add-path` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2020-10-01-github-actions-deprecating-set-env-and-add-path-commands/

Relates to:

• https://github.com/manusa/actions-setup-minikube/issues/22
• https://github.blog/changelog/2020-10-01-github-actions-deprecating-set-env-and-add-path-commands/