Bump urllib3 from 1.26.11 to 1.26.18 in /source/lambda/boto3

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.11 to 1.26.18.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](urllib3/urllib3@1.26.11...1.26.18)

---
updated-dependencies:
- dependency-name: urllib3
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

source/lambda/boto3/requirements.txt

@@ -5,5 +5,5 @@ boto3==1.24.37
 botocore==1.27.37
 s3transfer==0.6.0
 six==1.16.0
-urllib3==1.26.11
+urllib3==1.26.18
 filetype==1.1.0