fix: requirements.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-CERTIFI-3164749
- https://snyk.io/vuln/SNYK-PYTHON-CERTIFI-5805047
- https://snyk.io/vuln/SNYK-PYTHON-FLASK-5490129
- https://snyk.io/vuln/SNYK-PYTHON-JINJA2-6150717
- https://snyk.io/vuln/SNYK-PYTHON-REQUESTS-5595532
- https://snyk.io/vuln/SNYK-PYTHON-URLLIB3-5926907
- https://snyk.io/vuln/SNYK-PYTHON-URLLIB3-6002459
- https://snyk.io/vuln/SNYK-PYTHON-WERKZEUG-3319935
- https://snyk.io/vuln/SNYK-PYTHON-WERKZEUG-3319936
- https://snyk.io/vuln/SNYK-PYTHON-WERKZEUG-6035177

requirements.txt

@@ -16,7 +16,7 @@ botocore==1.20.101
     #   s3transfer
 cachelib==0.1.1
     # via flask-session
-certifi==2020.6.20
+certifi==2023.7.22
     # via requests
 cffi==1.14.2
     # via cryptography
@@ -34,7 +34,7 @@ digitalmarketplace-utils==60.11.0
     # via sanitized-package
 docopt==0.6.2
     # via notifications-python-client
-flask==1.1.4
+flask==2.2.5
     # via
     #   digitalmarketplace-utils
     #   flask-gzip
@@ -67,7 +67,7 @@ itsdangerous==1.1.0
     # via
     #   flask
     #   flask-wtf
-jinja2==2.11.3
+jinja2==3.1.3
     # via
     #   flask
     #   sanitized-package
@@ -103,7 +103,7 @@ pyyaml==6.0
     # via sanitized-package
 redis==3.5.3
     # via digitalmarketplace-utils
-requests==2.25.1
+requests==2.31.0
     # via
     #   digitalmarketplace-utils
     #   mailchimp3
@@ -116,11 +116,11 @@ six==1.15.0
     #   python-dateutil
 unicodecsv==0.14.1
     # via digitalmarketplace-utils
-urllib3==1.26.6
+urllib3==1.26.18
     # via
     #   botocore
     #   requests
-werkzeug==1.0.1
+werkzeug==2.3.8
     # via flask
 workdays==1.4
     # via digitalmarketplace-utils