Revise Python version support information in README

Updated README to reflect the dropping of support for Python 3.9.

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: bcantoni

README.md

@@ -9,7 +9,7 @@ Use the Tableau Server Client (TSC) library to increase your productivity as you
 * Create users and groups.
 * Query projects, sites, and more.
 
-This repository contains Python source code for the library and sample files showing how to use it. As of October 2026, support for Python 3.9 will be dropped - support for older versions of Python aims to match https://devguide.python.org/versions/
+This repository contains Python source code for the library and sample files showing how to use it. As of October 2026, support for Python 3.9 has been dropped; support for older versions of Python aims to match https://devguide.python.org/versions/
 
 To see sample code that works directly with the REST API (in Java, Python, or Postman), visit the [REST API Samples](https://github.com/tableau/rest-api-samples) repo.