doc(release): release notes for v2.1.0

Signed-off-by: Raphael Defosseux <raphael.defosseux@openairinterface.org>

CHANGELOG.md

 # RELEASE NOTES: #
 
+## v2.1.0 -- August 2024 ##
+
+* Features
+  - Add possibility to read QoS values from file
+* Fixes
+  - Fix HTTP/2 server shutdown
+  - Use new FlowDirection fix
+* Tech Debt
+  - Stopping support for RHEL8/Rocky8 in favor of RHEL9/Rocky9
+  - HTTP client cpr library refactoring effort
+
 ## v2.0.0 -- December 2023 ##
 
 * Features

common @ 3b119a93

-Subproject commit 30956f071e69d075ee70fc4c6fadcfc084a9da4d
+Subproject commit 3b119a93f7009d09036466f97f4f50e2738baae2

oai-cn5g-common-src @ c110f975

-Subproject commit ce3819f54bc32f6af35b1e63b59cc8622961f2d1
+Subproject commit c110f9753ddf95ad107368d2d72f593ee14b1ae7