fix sample app dependencies imcompatible with xray sdk

Author: wangzlei

sample-apps/flask/requirements.txt

@@ -1,14 +1,11 @@
 boto3
-certifi==2022.12.7
-chardet==3.0.4
-click==7.1.2
-Flask==1.1.2
-idna==2.9
-itsdangerous==1.1.0
-Jinja2==2.11.3
-MarkupSafe==1.1.1
-requests==2.23.0
-urllib3==1.26.5
+certifi
+chardet
+Flask
+idna
+requests
+urllib3
 Werkzeug==2.2.3
-flask-sqlalchemy==2.4.3
+flask-sqlalchemy==2.5.1
+SQLAlchemy==1.4
 aws_xray_sdk==2.6.0