docs: bump the arm compiler version

Patch fdae0b95852e087d8a19187f4d40babc67f0e57a in the CI bumped it to
6.23. Reflect this in docs

Change-Id: I39f3cd6fb03f81066fbbae3672c79802c607e3cd
Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>
diff --git a/docs/getting_started/prerequisites.rst b/docs/getting_started/prerequisites.rst
index 32c2b39..768e4fe 100644
--- a/docs/getting_started/prerequisites.rst
+++ b/docs/getting_started/prerequisites.rst
@@ -26,7 +26,7 @@
 ======================== =====================
         Program          Min supported version
 ======================== =====================
-Arm Compiler             6.18
+Arm Compiler             6.23
 Arm GNU Compiler         13.3
 Clang/LLVM               18.1.8
 Device Tree Compiler     1.6.1
@@ -184,7 +184,7 @@
 
 --------------
 
-*Copyright (c) 2021-2024, Arm Limited. All rights reserved.*
+*Copyright (c) 2021-2025, Arm Limited. All rights reserved.*
 
 .. _Arm Developer website: https://developer.arm.com/tools-and-software/open-source-software/developer-tools/gnu-toolchain/downloads
 .. _Gerrit Code Review: https://www.gerritcodereview.com/