Create requirements.txt

Author: rogers-cyber

38-Email-sender-script/requirements.txt

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+fastapi==0.115.2
+uvicorn==0.25.0
+pandas==2.1.0
+google-auth==2.23.0
+google-auth-oauthlib==1.1.0
+google-auth-httplib2==0.1.0
+google-api-python-client==2.87.0
+python-dotenv==1.0.0
+email-validator==2.3.1
+tenacity==9.3.0