chore(framework/pylons): pin github actions ubuntu runner to 20.04

[Yun-Kim]

Description

GitHub setup-python@v2 actions now fail to install Python 2.7 for our Pylons framework tests. This is because the ubuntu-latest runner (which is now ubuntu-22.04) does not support Python 2.7. This framework test setup action has been pinned to ubuntu-20.04 as this is the last version to support Python 2.7.

See upstream issue for more information.

Checklist

• Followed the library release note guidelines when writing a release note.
• Add additional sections for feat and fix pull requests.
• Library documentation and/or Datadog's documentation site is updated. Link to doc PR in description.

Motivation

Design

Testing strategy

Relevant issue(s)

Testing strategy

Reviewer Checklist

• Title is accurate.
• Description motivates each change.
• No unnecessary changes were introduced in this PR.
• Avoid breaking API changes unless absolutely necessary.
• Tests provided or description of manual testing performed is included in the code or PR.
• Release note has been added and follows the library release note guidelines, or else changelog/no-changelog label added.
• All relevant GitHub issues are correctly linked.
• Backports are identified and tagged with Mergifyio.

[mabdinur]

@Mergifyio backport 0.61 1.6 1.5

[mergify]

backport 0.61 1.6 1.5

✅ Backports have been created

• #4620 chore(framework/pylons): pin github actions ubuntu runner to 20.04 (backport #4619) has been created for branch 0.61
• #4621 chore(framework/pylons): pin github actions ubuntu runner to 20.04 (backport #4619) has been created for branch 1.6
• #4622 chore(framework/pylons): pin github actions ubuntu runner to 20.04 (backport #4619) has been created for branch 1.5