chore: remove support for Python 3.7 (#974)

Co-authored-by: Jacek Gruzewski <[email protected]>
Co-authored-by: Ricardo Amaro <[email protected]>

.github/workflows/test.yml

@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.7, 3.8, 3.9]
+        python-version: [3.8, 3.9]
 
     steps:
       - name: Checkout kapitan recursively

.pre-commit-config.yaml

@@ -3,7 +3,7 @@ repos:
     rev: 22.10.0
     hooks:
     - id: black
-      language_version: python3.7
+      language_version: python3.8
   - repo: https://github.com/igorshubovych/markdownlint-cli
     rev: v0.32.2
     hooks:

Dockerfile

@@ -1,5 +1,5 @@
 # Build the virtualenv for Kapitan
-FROM python:3.7-slim AS python-builder
+FROM python:3.8-slim AS python-builder
 
 ARG TARGETARCH
 
@@ -37,7 +37,7 @@ RUN curl -fsSL -o get_helm.sh https://raw.githubusercontent.com/helm/helm/master
     && rm get_helm.sh
 
 # Final image with virtualenv built in previous step
-FROM python:3.7-slim
+FROM python:3.8-slim
 
 COPY --from=python-builder /opt/venv /opt/venv