docs(prerequisites): update mbedtls to v3.6.3

Signed-off-by: Lauren Wehrmeister <lauren.wehrmeister@arm.com>
Change-Id: I62bc0fd6e40a38143ad3118a2e8e8d63c728a675
(cherry picked from commit 247ce406f41e91ad0990ae5ae883b8dc6906c3a4)
1 file changed