docs(changelog): changelog for v2.13 release

Generated this change-log using below command:
npm run release -- --skip.commit --skip.tag --release-as 2.13.0

Change-Id: Ibb0623f04c641b65a03deaffd50a5a8b65637419
Signed-off-by: Govindraj Raja <govindraj.raja@arm.com>
diff --git a/package-lock.json b/package-lock.json
index 57b44de..92921f9 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "trusted-firmware-a",
-  "version": "2.12.0",
+  "version": "2.13.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "trusted-firmware-a",
-      "version": "2.12.0",
+      "version": "2.13.0",
       "license": "BSD-3-Clause",
       "devDependencies": {
         "@commitlint/cli": "^19.0.0",