Bump flask from 1.1.2 to 2.3.2 in /04_flask#12

dependabot[bot] wants to merge 1 commit intomastershibing624/python-tutorial:masterfrom

dependabot/pip/04_flask/flask-2.3.2shibing624/python-tutorial:dependabot/pip/04_flask/flask-2.3.2Copy head branch name to clipboard