docs: update toolchain requirements to 14.2.Rel1

TF-A tests have been validated with toolchain version 14.2.Rel1.
Update documentation to reflect this as the current supported version.

Change-Id: I304a0ce11cab23c5047c9ed772fd53af58a21ac7
Signed-off-by: Jayanth Dodderi Chidanand <jayanthdodderi.chidanand@arm.com>
diff --git a/docs/getting_started/requirements.rst b/docs/getting_started/requirements.rst
index 14e4458..4658f1f 100644
--- a/docs/getting_started/requirements.rst
+++ b/docs/getting_started/requirements.rst
@@ -40,7 +40,7 @@
 Note that at least Python 3.8 is required.
 
 Download and install the GNU cross-toolchain from Arm. The TF-A Tests have
-been tested with version 13.3.Rel1 (gcc 13.3):
+been tested with version 14.2.Rel1 (GCC 14.2):
 
 -  `GCC cross-toolchain`_
 
@@ -53,4 +53,4 @@
 
 --------------
 
-*Copyright (c) 2019-2024, Arm Limited. All rights reserved.*
+*Copyright (c) 2019-2025, Arm Limited. All rights reserved.*