[goel-akas]

Issue #, if available: #3445

Description of changes:
Add Lambda.update_configuration() to support updating function configuration (timeout, memory, runtime, handler, role, vpc, env, layers) via update_function_configuration boto3 API. Includes retry logic for ResourceConflictException consistent with existing update().

Also fixes typo in update(): 'funtion:' -> 'function:' in ARN parsing.

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[mohamedzeidan2021]

Thanks for this, and sorry for the long silence. Still wanted — update_configuration()
is missing from lambda_helper.py and #3445 is still open. The funtion: → function:
fix is real too: the typo means split(":")[0] runs on the whole ARN, so the S3 prefix
ends up as the literal "arn".

Tests pass (33/33); the only conflict is docs/index.rst over a trailing newline.

Three things before merge:

1. It resets fields the caller didn't touch. timeout, memory_size, and runtime
default to 120, 128, "python3.8" in __init__, so the is not None guards always
fire — changing only memory_size also sends Runtime='python3.8' and Timeout=120,
downgrading a live function to an EOL runtime. Needs explicit kwargs on
update_configuration(...) or sentinel defaults.

2. Codestyle blocks. flake8 E303 before def upsert; black src/sagemaker/core/lambda_helper.py fixes it.

3. Split out the typo fix into its own PR so it can merge now, separate from (1).

[mohamedzeidan2021]

Closing for now. Stale PR. Please re-open if you would like to start conversation again on getting this merged.