chore: Track flagsmith-python-sdk 5.3.1 (#7453)

Co-authored-by: flagsmith-engineering[bot] <flagsmith-engineering[bot]@users.noreply.github.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: 3 people

api/app_analytics/constants.py

@@ -81,6 +81,7 @@
         "5.1.1",
         "5.2.0",
         "5.3.0",
+        "5.3.1",
     ],
     "flagsmith-ruby-sdk": [
         "unknown",