Bump python runtime to bump cdk klayers cryptography version (#1707)

### Feature or Bugfix
<!-- please choose -->
- Bugfix


### Detail
- Bump python runtime and cdk klayers cryptography version for custom
authorizer


### Relates
- <URL or Ticket>

### Security
Please answer the questions below briefly where applicable, or write
`N/A`. Based on
[OWASP 10](https://owasp.org/Top10/en/).

- Does this PR introduce or modify any input fields or queries - this
includes
fetching data from storage outside the application (e.g. a database, an
S3 bucket)?
  - Is the input sanitized?
- What precautions are you taking before deserializing the data you
consume?
  - Is injection prevented by parametrizing queries?
  - Have you ensured no `eval` or similar functions are used?
- Does this PR introduce any functionality or component that requires
authorization?
- How have you ensured it respects the existing AuthN/AuthZ mechanisms?
  - Are you logging failed auth attempts?
- Are you using or adding any cryptographic features?
  - Do you use a standard proven implementations?
  - Are the used keys controlled by the customer? Where are they stored?
- Are you introducing any new policies/roles/users?
  - Have you used the least-privilege principle? How?


By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache 2.0 license.

deploy/stacks/lambda_api.py

@@ -260,7 +260,7 @@ def __init__(
             )
 
         # Initialize Klayers
-        runtime = _lambda.Runtime.PYTHON_3_9
+        runtime = _lambda.Runtime.PYTHON_3_12
         klayers = Klayers(self, python_version=runtime, region=self.region)
 
         # get the latest layer version for the cryptography package