chore: upgrade urllib3 to 2.6.0+ and update dependencies

[sankeyraut]

Summary

Upgrade urllib3 to version 2.6.0 or greater across all Lambda functions to address security vulnerabilities and ensure compatibility.

Changes

Dependency Updates (all 7 Lambda functions)

Package	Old Version	New Version
urllib3	2.2.3 (transitive)	>=2.6.0,<3 (explicit, locked to 2.6.2)
requests	^2.32.3	^2.32.5
boto3	^1.35.30	^1.38.0
moto	^4.1.4	^5.0.0

Test Code Migration (moto 5.x breaking changes)

Updated test files to use unified mock_aws decorator instead of individual mocks (mock_s3, mock_wafv2, mock_dynamodb, etc.):

• source/access_handler/test/conftest.py
• source/custom_resource/test/conftest.py
• source/helper/test/conftest.py
• source/helper/test/test_stack_requirements.py
• source/ip_retention_handler/test/conftest.py
• source/log_parser/test/conftest.py

Affected Lambda Functions

• access_handler
• custom_resource
• helper
• ip_retention_handler
• log_parser
• reputation_lists_parser
• timer

Testing

✅ All 100 unit tests pass across all Lambda functions:

Lambda	Tests	Status
access_handler	3	✅ Passed
custom_resource	32	✅ Passed
helper	15	✅ Passed
ip_retention_handler	18	✅ Passed
log_parser	28	✅ Passed
reputation_lists_parser	3	✅ Passed
timer	1	✅ Passed

Transitive Dependency Compatibility

All parent packages support urllib3 2.6.0+:

• requests 2.32.5 → urllib3 <3,>=1.21.1 ✓
• boto3 1.42.16 → botocore → urllib3 !=2.2.0,<3,>=1.25.4 ✓
• moto 5.1.18 → responses 0.25.3 → urllib3 <3.0,>=1.25.10 ✓

Checklist

• Updated pyproject.toml for all 7 Lambda functions
• Regenerated poetry.lock files
• Migrated test code for moto 5.x compatibility
• All unit tests pass