feat(docs): update Mbed-TLS version to v2.28.5

Update Mbed-TLS to the latest v2.28 LTS branch version (2.28.5).

Signed-off-by: Yann Gautier <yann.gautier@st.com>
Change-Id: Ibf27d775be2a434c0ab0d5db349a00c19e83a662
1 file changed