docs(changelog): changelog for lts-v2.10.4 release

Change-Id: I216dd3799384212f6bc87977501ad4f0f371d57f
diff --git a/pyproject.toml b/pyproject.toml
index 2a34ac4..203e4d8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "trusted-firmware-a"
-version = "2.10.3"
+version = "2.10.4"
 description = "Trusted Firmware-A (TF-A) Python dependencies."
 authors = ["Arm Ltd."]
 license = "BSD-3-Clause"