fix: Set the default value of replacement_security_group_ids to null

[ricoli]

Description

Fix the validation error caused by https://github.com/terraform-aws-modules/terraform-aws-lambda/pull/422 (released in version 4.12.0), and reported in https://github.com/terraform-aws-modules/terraform-aws-lambda/issues/433 which is being triggered because the default value of replacement_security_group_ids is [], not null.

Motivation and Context

Fixes #433

Breaking Changes

How Has This Been Tested?

• [x] I have updated at least one of the examples/* to demonstrate and validate my change(s)
• [x] I have tested and validated these changes using one or more of the provided examples/* projects
• [x] I have executed pre-commit run -a on my pull request

[antonbabenko]

This PR is included in version 4.12.1 :tada:

[github-actions[bot]]

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