Bump urllib3 from 1.26.17 to 1.26.18 in /backend/lambda_layers/aws_sdk

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.17 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@1.26.17...1.26.18)

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

Signed-off-by: dependabot[bot] <[email protected]>

backend/lambda_layers/aws_sdk/requirements.txt

@@ -5,10 +5,10 @@
 #    pip-compile --output-file=backend/lambda_layers/aws_sdk/requirements.txt backend/lambda_layers/aws_sdk/requirements.in
 #
 aws-assume-role-lib==2.10.0
-    # via -r backend/lambda_layers/aws_sdk/requirements.in
+    # via -r requirements.in
 boto3==1.24.38
     # via
-    #   -r backend/lambda_layers/aws_sdk/requirements.in
+    #   -r requirements.in
     #   aws-assume-role-lib
 botocore==1.27.38
     # via
@@ -24,7 +24,7 @@ s3transfer==0.6.0
     # via boto3
 six==1.16.0
     # via python-dateutil
-urllib3==1.26.17
+urllib3==1.26.18
     # via
-    #   -r backend/lambda_layers/aws_sdk/requirements.in
+    #   -r requirements.in
     #   botocore