chore: Track flagsmith-elixir-sdk 2.3.1 (#6260)

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

@@ -23,6 +23,7 @@
     "flagsmith-elixir-sdk": [
         "unknown",
         "2.3.0",
+        "2.3.1",
     ],
     "flagsmith-flutter-sdk": [
         "unknown",