Publish changelog for api-2024.08.12.17.31.11 (#4745)

Co-authored-by: stacimc <63313398+stacimc@users.noreply.github.com>

Author: openverse-bot

documentation/changelogs/api/2024.08.12.17.31.11.md

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+# 2024.08.12.17.31.11
+
+## Internal Improvements
+
+- Decrease thumbnail upstream timeout and add timing logs for thumbnail requests
+  ([#4695](https://github.com/WordPress/openverse/pull/4695)) by @sarayourfriend