Update python Docker tag to v3.13

Signed-off-by: red-hat-konflux <126015336+red-hat-konflux[bot]@users.noreply.github.com>

docs/samples/explanation/aif/germancredit/server/Dockerfile

@@ -1,6 +1,6 @@
 # Use the official lightweight Python image.
 # https://hub.docker.com/_/python
-FROM python:3.7-slim
+FROM python:3.13-slim
 
 ENV APP_HOME /app
 WORKDIR $APP_HOME

docs/samples/explanation/aix/mnist/rfserver/rf.Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.7
+FROM python:3.13
 
 COPY . .
 RUN pip install --no-cache-dir --upgrade pip && pip install --no-cache-dir kserve

docs/samples/kafka/transformer.Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.9-slim
+FROM python:3.13-slim
 
 RUN apt-get update && apt-get install -y libglib2.0-0
 RUN pip install --no-cache-dir --upgrade pip && pip install --no-cache-dir kserve

docs/samples/v1beta1/transformer/feast/driver_transformer.Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.9-slim
+FROM python:3.13-slim
 
 COPY driver_transformer driver_transformer
 WORKDIR driver_transformer

docs/samples/v1beta1/transformer/feast/feast_server.Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.9-slim
+FROM python:3.13-slim
 RUN pip install --upgrade pip && pip install "feast[gcp]~=0.30.0" "feast[redis]~=0.30.0" "feast[aws]~=0.30.0"
 ENV FEAST_USAGE=False
 EXPOSE 6566

docs/samples/v1beta1/transformer/feast/feature_store_initializer.Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.9-slim
+FROM python:3.13-slim
 RUN pip install --upgrade pip && pip install "feast[gcp]~=0.30.0" "feast[redis]~=0.30.0" "feast[aws]~=0.30.0"
 WORKDIR feature_store_initializer
 COPY feature_store_initializer_entrypoint.sh feature_store_initializer_entrypoint.sh

docs/samples/v1beta1/triton/fastertransformer/transformer/Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.9-slim-bullseye
+FROM python:3.13-slim-bullseye
 WORKDIR /code
 COPY requirements.txt requirements.txt
 RUN pip install -r requirements.txt