[renzon]

What does this PR do?

Bumps __version__ to 1.7.3 and retitles the CHANGELOG "Unreleased" section for everything merged since v1.7.2: #566 (the roboflow api-key roll command and the rotation-schedule flags on create and update). No breaking changes.

Related Issue(s): ENT-2118

Type of Change

• Other: release preparation

Testing

• I have tested this change locally

Test details:
python -c "import roboflow; print(roboflow.__version__)" prints 1.7.3.

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• My changes generate no new warnings or errors

[shntu]

[Codex v0.164.0 · gpt-6.1-sol · ultra]

The changes consistently update the SDK version and changelog to 1.7.3. Version extraction checks passed; the targeted unit tests could not run because the responses dependency is missing.