CI: bump-deployments - skip commit when submodules already up to date

[neddp]

git commit exits 1 when there is nothing to commit, failing the task even when the submodules are already pinned to the desired versions. This blocks the following tasks in the pipeline.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 99a6a010-581d-44d7-b94c-e42162ac52a1

📥 Commits

Reviewing files that changed from the base of the PR and between 5e7f7e4 and a80b08f.

📒 Files selected for processing (1)

• ci/tasks/bump-deployments/task

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Walkthrough

The deployment bump task now checks whether the working tree differs from HEAD. It creates the Update deployments commit only when changes exist. Unchanged repositories no longer receive an empty commit.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the CI task and the change to skip commits when submodules are already up to date.
Description check	✅ Passed	The description explains the failure condition and how the change prevents pipeline tasks from being blocked.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-bump-deployments-nothing-to-commit

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