Update dev HISTORY with 2.19.1 and 2.18.4 content. (#4677)

---
TYPE: NO_HISTORY
DESC: Update dev HISTORY with 2.19.1 and 2.18.4 content.

Author: KiterLuc

HISTORY.md

@@ -19,6 +19,7 @@
 * Fix traversal limit in array deserialization. [#4606](https://github.com/TileDB-Inc/TileDB/pull/4606)
 * Add function random_label to utilize PRNG for random string generation. [#4564](https://github.com/TileDB-Inc/TileDB/pull/4564)
 * Remove uuid in favor of random_label. [#4589](https://github.com/TileDB-Inc/TileDB/pull/4589)
+* Improve large dense aggregate reads with tile metadata only. [#4657](https://github.com/TileDB-Inc/TileDB/pull/4657)
 
 ## Defects removed
 
@@ -43,6 +44,17 @@
 * Add vcpkg triplets for Address Sanitizer. [#4515](https://github.com/TileDB-Inc/TileDB/pull/4515)
 * Fix regression where release artifacts had 8-digit commit hashes. [#4599](https://github.com/TileDB-Inc/TileDB/pull/4599)
 
+# TileDB v2.19.1 Release Notes
+
+## Improvements
+
+* Improve large dense aggregate reads with tile metadata only. [#4657](https://github.com/TileDB-Inc/TileDB/pull/4657)
+
+## Defects removed
+
+* Fix HTTP requests for AWS assume role with web identity not honoring config options. [#4641](https://github.com/TileDB-Inc/TileDB/pull/4641)
+* Fix HTTP requests for AWS assume role not honoring config options. [#4616](https://github.com/TileDB-Inc/TileDB/pull/4616)
+
 # TileDB v2.19.0 Release Notes
 
 ## Announcements
@@ -124,6 +136,13 @@
 
 * Remove UnitTestConfig::array_encryption_key_length. [#4482](https://github.com/TileDB-Inc/TileDB/pull/4482)
 
+# TileDB v2.18.4 Release Notes
+
+## Defects removed
+
+* Fix HTTP requests for AWS assume role not honoring config options. [#4616](https://github.com/TileDB-Inc/TileDB/pull/4616)
+* Fix HTTP requests for AWS assume role with web identity not honoring config options. [#4641](https://github.com/TileDB-Inc/TileDB/pull/4641)
+
 # TileDB v2.18.3 Release Notes
 
 ## New features