Prep 7.8.0

[apollonin]

Version 7.8.0

Added

• ModelRun.total_cost and ModelRun.total_data_rows properties to retrieve inference cost and data row count for a model run
• ModelRun.refresh_cost_and_usage() to re-fetch live cost and usage data

Release checklist

• libs/labelbox/pyproject.toml version bumped
• libs/labelbox/src/labelbox/__init__.py version bumped
• docs/conf.py release bumped
• CHANGELOG.md updated

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Note

Low Risk
Release metadata and version string updates only; no runtime logic changes in this diff.

Overview
Prepares release 7.8.0 of the Labelbox Python SDK by bumping the package version from 7.7.0 to 7.8.0 in pyproject.toml, labelbox.__version__, and Sphinx docs/conf.py.

CHANGELOG.md gains a 7.8.0 (2026-06-11) section that documents the user-facing additions shipped for this release: ModelRun.total_cost and ModelRun.total_data_rows, plus ModelRun.refresh_cost_and_usage() for refreshing cached inference cost and usage (via #2057).

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[ChuckTerry]

Approved! Any chance you want to throw a docs only PR in with that update? Don't let this block, just asking :)