update requirements.txt

Author: danielviki

backend/requirements.txt

@@ -1,9 +1,9 @@
-flask==3.0.0
-flask-cors==4.0.0
-python-dotenv==1.0.0
-werkzeug==3.0.1
-click==8.1.7
-blinker==1.7.0
-itsdangerous==2.1.2
-Jinja2==3.1.2
-MarkupSafe==2.1.3
+flask>=3.0.0
+flask-cors>=4.0.2
+python-dotenv>=1.0.0
+werkzeug>=3.0.6
+click>=8.1.7
+blinker>=1.7.0
+itsdangerous>=2.1.2
+Jinja2>=3.1.5
+MarkupSafe>=2.1.3