Bump python from 3.12.6-slim to 3.12.7-slim in /infra (#4534)

Bumps python from 3.12.6-slim to 3.12.7-slim.

---
updated-dependencies:
- dependency-name: python
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

infra/dockerfile.base

@@ -1,4 +1,4 @@
-FROM python:3.12.6-slim
+FROM python:3.12.7-slim
 
 # Setup dependencies in a cacheable step
 RUN --mount=type=bind,source=requirements.txt,target=/requirements.txt \

infra/dockerfile.spawn_pipeline

@@ -1,4 +1,4 @@
-FROM python:3.12.6-slim
+FROM python:3.12.7-slim
 
 # Setup dependencies in a cacheable step
 ADD spawn_pipeline_requirements.txt /code/