fix: Amazon-Price-Alert/requirements.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-CERTIFI-5805047

Author: snyk-bot

Amazon-Price-Alert/requirements.txt

@@ -1,7 +1,7 @@
 appdirs==1.4.4
 beautifulsoup4==4.9.1
 bs4==0.0.1
-certifi==2020.6.20
+certifi==2023.7.22
 chardet==3.0.4
 cssselect==1.1.0
 fake-useragent==0.1.11