[FIX] Hard-specify Python versions in pre-commit for Odoo <=12

The flake8 version used by these Odoo versions does not work with more
recent versions of Python.

Signed-off-by: Carmen Bianca Bakker <carmen@coopiteasy.be>

.github/workflows/test.yml

@@ -19,12 +19,19 @@ jobs:
           - 3.6
           - 3.8
         odoo-version:
-          - 10.0
           - 11.0
           - 12.0
           - 13.0
           - 14.0
           - 15.0
+        include:
+          - python-version: 2.7
+            odoo-version: 10.0
+        exclude:
+          - python-version: 3.8
+            odoo-version: 11.0
+          - python-version: 3.8
+            odoo-version: 12.0
     steps:
       # Prepare environment
       - uses: actions/checkout@v2.3.3

src/.github/workflows/pre-commit.yml.jinja

@@ -15,6 +15,13 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-python@v2
+{%- if 10 < odoo_version < 13 %}
+        with:
+          python-version: "3.6"
+{%- elif odoo_version <= 10 %}
+        with:
+          python-version: "2.7"
+{%- endif %}
       - name: Get python version
         run: echo "PY=$(python -VV | sha256sum | cut -d' ' -f1)" >> $GITHUB_ENV
       - uses: actions/cache@v1

version-specific/mqt-compat/.pre-commit-config.yaml.jinja

@@ -40,7 +40,7 @@ repos:
     rev: v3.4.1
     hooks:
       - id: flake8
-        language_version: python{% if odoo_version < 11 %}2{% else %}3{% endif %}
+        language_version: python{% if odoo_version < 11 %}2{% else %}3.6{% endif %}
         name: flake8 excluding __init__.py
         exclude: __init__\.py
   - repo: https://github.com/pre-commit/mirrors-pylint