Bump python from 3.9.4-slim to 3.9.5-slim in /infra (#2341)

Bumps python from 3.9.4-slim to 3.9.5-slim.

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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:3.9.4-slim
+FROM python:3.9.5-slim
 
 # Setup dependencies in a cacheable step
 COPY requirements.txt /requirements.txt

infra/dockerfile.spawn_pipeline

@@ -1,4 +1,4 @@
-FROM python:3.9.4-slim
+FROM python:3.9.5-slim
 
 # Setup dependencies in a cacheable step
 ADD spawn_pipeline_requirements.txt /code/