[BUG] Fix CI workflow for Python 3.9 Poetry compatibility

[asingamaneni]

Describe the bug
Poetry 2.x (specifically 2.3.2, released Feb 1, 2026) requires Python >= 3.10. The workflow's Python 3.9 matrix job was installing the latest Poetry, which no longer supports Python 3.9, causing the failure. The other matrix jobs (3.10, 3.11, 3.12) were cancelled because the 3.9 job failed first.

https://github.com/Nike-Inc/brickflow/actions/runs/21610347174

Expected behavior
Github Actions should succeed

Screenshots
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