docs(prerequisites): update mbedtls to v3.6.3

Signed-off-by: Lauren Wehrmeister <lauren.wehrmeister@arm.com>
Change-Id: I62bc0fd6e40a38143ad3118a2e8e8d63c728a675
diff --git a/docs/getting_started/prerequisites.rst b/docs/getting_started/prerequisites.rst
index 768e4fe..a043991 100644
--- a/docs/getting_started/prerequisites.rst
+++ b/docs/getting_started/prerequisites.rst
@@ -31,7 +31,7 @@
 Clang/LLVM               18.1.8
 Device Tree Compiler     1.6.1
 GNU make                 3.81
-mbed TLS\ [#f1]_         3.6.2
+mbed TLS\ [#f1]_         3.6.3
 Node.js [#f2]_           16
 OpenSSL                  1.0.0
 Poetry                   1.3.2