Restrict pylint/pytest versions and bump CI tags

Description

• .gitlab-ci.yml: Bump tags for testsuite images

  These new images come with pinned versions of pytest and pylint:

  • pylint: == 2.1.1
  • pytest: >= 3.7

• dev-requirements.txt: Pin versions of pytest and pylint

  These packages should only be updated as a deliberate change and the code should be tested with the new versions to ensure that the test still pass.

  Any future updates should also happen in sync with the buildstream-docker-images repository so that the testsuite base images also enforce the same restrictions for the development requirements.

  Replaces !684 (closed).

Changes proposed in this merge request:

• .gitlab-ci.yml: Bump tags for testsuite images
• dev-requirements.txt: Pin versions of pytest and pylint

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added 1 commit

• ac443a69 - dev-requirements.txt: Pin versions of pytest and pylint

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added 1 commit

• 38709dcd - dev-requirements.txt: Pin versions of pytest and pylint

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changed title from .gitlab-ci.yml: Bump tags for testsuite images to Restrict pylint/pytest versions and bump CI tags

changed the description

enabled an automatic merge when the pipeline for 38709dcd succeeds

Great, let's do this on bst-1.2 also...

mentioned in merge request !690 (merged)

canceled the automatic merge

added 4 commits

• 38709dcd...3a4c147a - 2 commits from branch master
• d1bd8c0b - .gitlab-ci.yml: Bump tags for testsuite images
• 12d1cec2 - dev-requirements.txt: Pin versions of pytest and pylint

Compare with previous version

enabled an automatic merge when the pipeline for 12d1cec2 succeeds

merged

mentioned in commit 320b9562

mentioned in merge request !684 (closed)