chore(deps): Bump python from 3.12-slim to 3.13-slim in /rpc/integration

Bumps python from 3.12-slim to 3.13-slim.

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

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

rpc/integration/Dockerfile.test.runner

@@ -1,4 +1,4 @@
-FROM python:3.12-slim
+FROM python:3.13-slim
 WORKDIR /usr/src/app
 
 # install poetry