Update dependency prettytable to v3.15.1

Author: renovate[bot]

requirements.txt

@@ -5,7 +5,7 @@ locust==2.32.6
 selenium==4.27.1
 filelock==3.17.0
 packaging==24.2
-prettytable==3.12.0
+prettytable==3.15.1
 bzt==1.16.32        # bzt 1.16.34 has pinned setuptools==65.5.0, which does not have distutils
 boto3==1.36.0
 retry==0.9.2