fix: requirements.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-MYSQLCONNECTORPYTHON-7175985
- https://snyk.io/vuln/SNYK-PYTHON-MYSQLCONNECTORPYTHON-8225083
- https://snyk.io/vuln/SNYK-PYTHON-REQUESTS-6928867
- https://snyk.io/vuln/SNYK-PYTHON-URLLIB3-7267250
- https://snyk.io/vuln/SNYK-PYTHON-ZIPP-7430899

requirements.txt

@@ -11,3 +11,7 @@ python-Levenshtein
 artcommon @ git+https://github.com/openshift-eng/art-tools.git@main#subdirectory=artcommon
 rh-doozer @ git+https://github.com/openshift-eng/art-tools.git@main#subdirectory=doozer
 pyartcd @ git+https://github.com/openshift-eng/art-tools.git@main#subdirectory=pyartcd
+mysql-connector-python>=9.1.0 # not directly required, pinned by Snyk to avoid a vulnerability
+requests>=2.32.2 # not directly required, pinned by Snyk to avoid a vulnerability
+urllib3>=2.2.2 # not directly required, pinned by Snyk to avoid a vulnerability
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability