fix: requirements/base.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-DNSPYTHON-6241713

Author: snyk-bot

requirements/base.txt

@@ -26,4 +26,5 @@ requests==2.32.4
 git+https://github.com/Benbb96/soundcloud-python.git#egg=soundcloud
 spotipy==2.25.1
 zipp>=3.21.0 # not directly required, pinned by Snyk to avoid a vulnerability
-sqlparse>=0.5.0 # not directly required, pinned by Snyk to avoid a vulnerability
+sqlparse>=0.5.0 # not directly required, pinned by Snyk to avoid a vulnerability
+dnspython>=2.6.1 # not directly required, pinned by Snyk to avoid a vulnerability