Publish changelog for api-2024.03.04.15.15.13 (#3872)

Co-authored-by: stacimc <[email protected]>

documentation/changelogs/api/2024.03.04.15.15.13.md

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+# 2024.03.04.15.15.13
+
+## New Features
+
+- Add API schema tests using schemathesis
+  ([#3444](https://github.com/WordPress/openverse/pull/3444)) by @obulat
+- Add proportional staging index dag
+  ([#3763](https://github.com/WordPress/openverse/pull/3763)) by @stacimc
+
+## Internal Improvements
+
+- Update docker.io/nginx Docker tag to v1.25.4
+  ([#3857](https://github.com/WordPress/openverse/pull/3857)) by @openverse-bot
+- Update dependency fakeredis to v2.21.1
+  ([#3861](https://github.com/WordPress/openverse/pull/3861)) by @openverse-bot
+- Update dependency elasticsearch to v8.12.1
+  ([#3855](https://github.com/WordPress/openverse/pull/3855)) by @openverse-bot