fix: allow empty commit when preparing release PR

[thomasrockhu-codecov]

Summary

• The Create CLI Release PR workflow failed with nothing to commit, working tree clean (e.g. run 28972926678) when the version in pyproject.toml already matched the requested release version, so sed produced no diff and git commit exited non-zero.
• Add --allow-empty to the release commit so the release branch and PR are still created even when there is no version change.

Test plan

• Run the Create CLI Release PR workflow with a version that already matches pyproject.toml and confirm the branch/PR is created with an (empty) signed commit.

Made with Cursor

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
723	1	722	1

View the full list of 1 ❄️ flaky test(s)

api.temp.calculator.test_calculator::test_divide

Flake rate in main: 100.00% (Passed 0 times, Failed 1057 times)

Stack Traces | 0.001s run time

def
                test_divide():
                > assert Calculator.divide(1, 2) == 0.5
                E assert 1.0 == 0.5
                E + where 1.0 = <function Calculator.divide at 0x104c9eb90>(1, 2)
                E + where <function Calculator.divide at 0x104c9eb90> = Calculator.divide
                .../temp/calculator/test_calculator.py:30: AssertionError

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