docs: update toolchain requirements to 14.3.Rel1

TF-A tests have been validated with toolchain version 14.3.Rel1.
Update documentation to reflect this as the current supported version.

Change-Id: I3d88f2eec209c60e16b133392c2ed72b4b4acc4a
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 90b54aa..e5c1278 100644
--- a/docs/getting_started/requirements.rst
+++ b/docs/getting_started/requirements.rst
@@ -42,7 +42,7 @@
 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 14.2.Rel1 (GCC 14.2):
+been tested with version 14.3.Rel1 (GCC 14.3):
 
 -  `GCC cross-toolchain`_