fix: remove return from finally block to resolve Python 3.14 SyntaxWarning

[rithikanarayan]

What does this PR do?

This is a community PR #759

Removes return self.blocking_response from the finally block in _LambdaDecorator.call and defers it to after the try/except/finally block, eliminating the SyntaxWarning: 'return' in a 'finally' block emitted by Python 3.14 at cold start.

Motivation

Python 3.14 introduced a SyntaxWarning for return/break/continue inside finally blocks because a return in finally silently suppresses any exception actively propagating through the try/except. This warning was firing on every Lambda cold start and polluting CloudWatch logs for anyone running on the Python 3.14 runtime.

Fixes integration test snapshot changed introduced in #767.

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Types of Changes

• Bug fix
• New feature
• Breaking change
• Misc (docs, refactoring, dependency upgrade, etc.)

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