chore(ci): build using python 3.8 (#111)

Avoid python version mismatch that pulls incompatible dependencies in github actions when running unittests.

Signed-off-by: Antoine Bartuccio <antoine.bartuccio@vates.tech>

Author: klmp200

.github/workflows/main.yml

@@ -30,7 +30,7 @@ jobs:
       - name: Set up Python 3
         uses: actions/setup-python@v4
         with:
-          python-version: '3.x'
+          python-version: '3.8' # This version is the closest available to the one currently used in production (3.6).
 
       - name: Install dependencies
         run: |