chore(deps): bump the sdk-python group

Bumps the sdk-python group in /sdk/python/runtime with 2 updates: python and [astral-sh/uv](https://github.com/astral-sh/uv).


Updates `python` from 3.12-slim to 3.13-slim

Updates `astral-sh/uv` from 0.4.18 to 0.4.20
- [Release notes](https://github.com/astral-sh/uv/releases)
- [Changelog](https://github.com/astral-sh/uv/blob/main/CHANGELOG.md)
- [Commits](astral-sh/uv@0.4.18...0.4.20)

---
updated-dependencies:
- dependency-name: python
  dependency-type: direct:production
  dependency-group: sdk-python
- dependency-name: astral-sh/uv
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: sdk-python
...

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

sdk/python/runtime/Dockerfile

@@ -1,3 +1,3 @@
 # Images defined here for Dependabot.
-FROM python:3.12-slim@sha256:af4e85f1cac90dd3771e47292ea7c8a9830abfabbe4faa5c53f158854c2e819d AS base
-FROM ghcr.io/astral-sh/uv:0.4.18@sha256:7091de9df72a77bdc92d6460f09403b4bdd5b35fe54e3320e4e1cbdacf8cdd49 AS uv
+FROM python:3.13-slim@sha256:2ec5a4a5c3e919570f57675471f081d6299668d909feabd8d4803c6c61af666c AS base
+FROM ghcr.io/astral-sh/uv:0.4.20@sha256:4e7932d37d1156f8f7be5992363f1307160aff4b3031ee99b03155df78900575 AS uv