Update CHANGELOG-EE.md for 12.7.5-ee

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CHANGELOG-EE.md

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+## 12.7.5
+
+### Fixed (1 change)
+
+- Fix DB connection pool size for Geo database. !24021
+
+
 ## 12.7.3
 
 - No changes.

ee/changelogs/unreleased/199672-geo-initialization-order-issue-with-geo-database.yml

----
-title: Fix DB connection pool size for Geo database
-merge_request: 24021
-author:
-type: fixed