Freeze versions to avoid Flask 2.3 deprecation problems

backend/requirements.txt

@@ -1,30 +1,36 @@
-autopep8
-beautifulsoup4
-bs4
-certifi
-charset-normalizer
-click
-Flask
-Flask-BasicAuth
-greenlet
-gunicorn
-idna
-itsdangerous
-Jinja2
-mariadb
-MarkupSafe
-mysql
-mysqlclient
-numpy
-pandas
-pycodestyle
-PyMySQL
-python-dateutil
-pytz
-requests
-six
-soupsieve
-SQLAlchemy
-toml
-urllib3
-Werkzeug
+autopep8==2.0.2
+beautifulsoup4==4.12.0
+bs4==0.0.1
+certifi==2022.12.7
+charset-normalizer==3.1.0
+click==8.1.3
+flake8==6.0.0
+Flask==2.2.3
+Flask-BasicAuth==0.2.0
+greenlet==2.0.2
+gunicorn==20.1.0
+idna==3.4
+itsdangerous==2.1.2
+Jinja2==3.1.2
+mariadb==1.1.6
+MarkupSafe==2.1.2
+mccabe==0.7.0
+mysql==0.0.3
+mysqlclient==2.1.1
+numpy==1.24.2
+packaging==23.0
+pandas==1.5.3
+pycodestyle==2.10.0
+pyflakes==3.0.1
+PyMySQL==1.0.3
+python-dateutil==2.8.2
+pytz==2023.3
+requests==2.28.2
+six==1.16.0
+soupsieve==2.4
+SQLAlchemy==2.0.7
+toml==0.10.2
+tomli==2.0.1
+typing_extensions==4.5.0
+urllib3==1.26.15
+Werkzeug==2.2.3