[jcstorms1]

What does this PR do?

Pin the lint and unit-test jobs in the GitHub Actions build workflow to ubuntu-24.04, preserving the Python 3.8–3.14 test matrix.

Motivation

Scheduled builds on the same main commit changed from passing on Ubuntu 24.04 to failing on Ubuntu 26.04 when ubuntu-latest moved. Python 3.8 and 3.9 have no published Ubuntu 26.04 builds, so Python setup fails before lint or tests run.

• Last passing build: November 8, 00:23 UTC
• First failing build: November 8, 12:09 UTC

Testing Guidelines

• Parsed the workflow YAML and verified both runner pins and the complete Python matrix.
• git diff --check passes.
• Confirmed Python 3.8 and 3.9 Ubuntu 24.04 builds in the published actions/python-versions manifest and the last passing workflow logs.
• Full workflow validation will run on this PR.

Types of Changes

• Bug fix

Check all that apply

• This PR's description is comprehensive
• This PR's changes are covered by the automated tests
• This PR passes the integration tests (ask a Datadog member to run the tests)

[datadog-datadog-prod-us1]

More details

Pinning both jobs to Ubuntu 24.04 addresses the runner compatibility issue for Python 3.8 and 3.9 while preserving the Python 3.8–3.14 matrix. No actionable regression was identified.

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[rithikanarayan]