[skip-changelog] fix task check

[umbynos]

Please check if the PR fulfills these requirements

• The PR has no duplicates (please search among the Pull Requests
  before creating one)
• The PR follows
  our contributing guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• UPGRADING.md has been updated with a migration guide (for breaking changes)

• What kind of change does this PR introduce?

update of task check

• What is the current behavior?

Running task check yelds:
task: Failed to run task "check": task: Task "python:check" not found

• What is the new behavior?

everything works smoothly

• Does this PR introduce a breaking change, and is
  titled accordingly?

no

• Other information:

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