docs(changelog): changelog for v2.12 release

Generated this change-log using below command:
npm run release -- --skip.commit --skip.tag --release-as 2.12.0

Change-Id: Idb74f6a31bf2691e7666e2738030d6f0e2b8c519
Signed-off-by: Govindraj Raja <govindraj.raja@arm.com>
diff --git a/pyproject.toml b/pyproject.toml
index f34c3d1..62878b4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "trusted-firmware-a"
-version = "2.11.0"
+version = "2.12.0"
 description = "Trusted Firmware-A (TF-A) Python dependencies."
 authors = ["Arm Ltd."]
 license = "BSD-3-Clause"