fix: examples/io/asset_export_csv_writer/requirements.txt to reduce v…

…ulnerabilities (#812)

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-ZIPP-7430899

Co-authored-by: snyk-bot <snyk-bot@snyk.io>
Co-authored-by: Steven McGrath <smcgrath@tenable.com>

examples/io/asset_export_csv_writer/requirements.txt

@@ -1,3 +1,4 @@
 click>=7.0
 pytenable>=0.3.15
-requests>=2.32.0 # not directly required, pinned by Snyk to avoid a vulnerability
+requests>=2.32.0 # not directly required, pinned by Snyk to avoid a vulnerability
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability