Adding Deprecation Warning For hash_type

[ericspod]

Description

Addresses missing deprecation warnings about the changing default value of hash_type in #9088. The solution in #9124 isn't ideal since the warning comes up in too many scenarios, the objective is to raise the warning when no value is passed explicitly to let users know to change things, and at the same time not breaking backwards compatibility. The behaviour defaults to using md5 as the hash_type, perhaps it's more secure for this to be sha256 despite compatibility breaking?

There's also one minor MLFlow test fix.

Types of changes

• Non-breaking change (fix or new feature that would not break existing functionality).
• Breaking change (fix or new feature that would cause existing functionality to change).
• New tests added to cover the changes.
• Integration tests passed locally by running ./runtests.sh -f -u --net --coverage.
• Quick tests passed locally by running ./runtests.sh --quick --unittests --disttests.
• In-line docstrings updated.
• Documentation updated, tested make html command in the docs/ folder.

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• monai/apps/utils.py
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📝 Walkthrough

Walkthrough

download_url, extractall, and download_and_extract now default hash_type to None. When hash_val is provided without hash_type, download_url and extractall warn and use SHA-256. Tests check both warning paths. Documentation describes the default.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~12 minutes

Merge Risk: ⚪ Minimal · up to 3d9c9

The checksum fallback remains SHA-256 when no algorithm is specified, while inspected MD5 paths select MD5 explicitly. The change adds the intended warning without a demonstrated checksum regression.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	Docstring coverage is 87.50% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 8 functions across 3 files.
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.
Title check	✅ Passed	The title clearly identifies the main change: adding a deprecation warning for the changing hash_type default.
Description check	✅ Passed	The description explains the motivation, compatibility behavior, related issue, and minor test fix. It includes the required Description and Types of changes sections. The template issue line is missi…

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Commit to this branch
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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

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Inline comments:
In `@monai/apps/utils.py`:
- Line 255: Update the deprecation warning messages in both functions that
default hash_type to "sha256" so they state “Defaulting to sha256 checking”
instead of MD5, and update both corresponding tests to assert the SHA-256
wording.

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Reviewing files that changed from the base of the PR and between c7e5ea0 and 89e359b.

📒 Files selected for processing (2)

• monai/apps/utils.py
• tests/apps/test_download_and_extract.py

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