Update python test versions and python image to 3.11

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -76,12 +76,11 @@ body:
     attributes:
       label: Version (kapitan)
       description: |
-        Which version of python are you using? Kapitan officially supports only version 3.8 and 3.9. 
+        Which version of python are you using? Kapitan officially supports only version 3.10 and 3.11 
         If you are using an older version of python, please check if the bug still exists with a newer (supported) version.
       options:
-        - '3.8'
-        - '3.9'
-        - 3.10 (future)
+        - "3.11"
+        - "3.10" 
         - I use kapitan directly (pip, docker)
       multiple: true
     validations:

.github/workflows/test-build-publish.yml

@@ -41,7 +41,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v4
         with:
-          python-version: '3.9'
+          python-version: '3.10'
       - uses: psf/black@main
 
   test:
@@ -51,7 +51,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.8, 3.9]
+        python-version: ['3.9', '3.10', '3.11']
 
     steps:
       - name: Checkout kapitan recursively

Dockerfile

@@ -1,5 +1,5 @@
 # Build the virtualenv for Kapitan
-FROM python:3.8-slim AS python-builder
+FROM python:3.11-slim AS python-builder
 ARG TARGETARCH
 ENV TARGETARCH=${TARGETARCH:-amd64}
 
@@ -11,7 +11,7 @@ RUN apt-get update \
         curl \
         build-essential
 
-ENV POETRY_VERSION=1.4.0
+ENV POETRY_VERSION=1.7.1
 ENV VIRTUAL_ENV=/opt/venv
 ENV PATH="$VIRTUAL_ENV/bin:/usr/local/go/bin:${PATH}"
 RUN python -m venv $VIRTUAL_ENV \
@@ -44,7 +44,7 @@ RUN pip install --editable .[test] \
 
 
 # Final image with virtualenv built in previous step
-FROM python:3.8-slim
+FROM python:3.11-slim
 
 ENV PATH="/opt/venv/bin:${PATH}"
 ENV HELM_CACHE_HOME=".cache/helm"