fix(wiremock): upgrade Lambda runtime to python3.12, drop urllib3<2 pin

python3.9 reached EOL in Oct 2025. urllib3 2.x (released Apr 2023) uses
bytes|str union syntax requiring Python 3.10+, causing a SyntaxError on
fresh CI installs that now resolve to urllib3 2.x by default.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: whummer

wiremock/sample-app-oss/main.tf

@@ -78,7 +78,7 @@ resource "aws_lambda_function" "hr_info_lambda" {
   source_code_hash = data.archive_file.lambda_zip.output_base64sha256
 
   handler = "handler.get_time_off"
-  runtime = "python3.9"
+  runtime = "python3.12"
 
   # Add a timeout for the function
   timeout = 10

wiremock/sample-app-oss/src/requirements.txt

@@ -1,2 +1 @@
 requests==2.31.0
-urllib3<2