add python 3.10 (#837)

* fix: use py 3.10 for v14

closes #836

* docs: update development readme for py versions

* ci: update github actions py version to 3.10

* Quote Python version in yaml files

* fix: typo in environment variable

Co-authored-by: Lev Vereshchagin <mail@vrslev.com>

.github/workflows/build_stable.yml

@@ -77,7 +77,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v4
         with:
-          python-version: 3.9
+          python-version: "3.10"
 
       - name: Get latest versions
         run: python3 ./.github/scripts/get_latest_tags.py --repo erpnext --version 13