Bump python from 1fc44d1 to b7a504d

Bumps python from `1fc44d1` to `b7a504d`.

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

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

Dockerfile

@@ -4,7 +4,7 @@
 #
 
 # Using python:3.9-slim
-FROM python@sha256:1fc44d17b4ca49a8715af80786f21fa5ed8cfd257a1e14e24f4a79b4ec329388
+FROM python@sha256:b7a504dd0affeb20cf1ba1d3219f854c889c7ad557a2a5a4c4aba19cadd075f1
 
 COPY requirements.txt /nca/
 RUN python -m pip install -U pip wheel setuptools && pip install -r /nca/requirements.txt