Bump base Docker image to 3.9.9 [skip ci]

Author: adamtheturtle

src/mock_vws/_flask_server/dockerfiles/target_manager/Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.9.1-slim-buster
+FROM python:3.9.9-slim-buster
 COPY . /app
 WORKDIR /app
 RUN pip install .

src/mock_vws/_flask_server/dockerfiles/vwq/Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.9.1-slim-buster
+FROM python:3.9.9-slim-buster
 COPY . /app
 WORKDIR /app
 RUN pip install .

src/mock_vws/_flask_server/dockerfiles/vws/Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.9.1-slim-buster
+FROM python:3.9.9-slim-buster
 COPY . /app
 WORKDIR /app
 RUN pip install .