DX: default to Python 3.9 in dev environment (#280)

.gitpod.yml

@@ -1,5 +1,5 @@
 tasks:
-  - init: pyenv local 3.8
+  - init: pyenv local 3.9
   - init: pip install -e .[dev]
 
 github:

environment.yml

@@ -2,7 +2,7 @@ name: compwa-policy
 channels:
   - defaults
 dependencies:
-  - python==3.8.*
+  - python==3.9.*
   - pip
   - pip:
       - -e .[dev]

src/compwa_policy/check_dev_files/__init__.py

@@ -204,7 +204,7 @@ def _create_argparse() -> ArgumentParser:
     )
     parser.add_argument(
         "--dev-python-version",
-        default="3.8",
+        default="3.9",
         help="Specify the Python version for your developer environment",
         required=False,
         type=str,

src/compwa_policy/check_dev_files/github_workflows.py

@@ -168,7 +168,7 @@ def __update_doc_section(
         del config["jobs"]["doc"]
     else:
         with_section = config["jobs"]["doc"]["with"]
-        if python_version != "3.8":
+        if python_version != "3.9":
             with_section["python-version"] = DoubleQuotedScalarString(python_version)
         if apt_packages:
             with_section["apt-packages"] = " ".join(apt_packages)
@@ -178,7 +178,7 @@ def __update_doc_section(
 
 
 def __update_style_section(config: CommentedMap, python_version: PythonVersion) -> None:
-    if python_version != "3.8":
+    if python_version != "3.9":
         config["jobs"]["style"]["with"] = {
             "python-version": DoubleQuotedScalarString(python_version)
         }