Add ChangeLog for potential overread with USE_PSA
Add ChangeLog for potential overread with USE_PSA

The issue was fixed while adding support for static ECDH with Opaque
keys: https://github.com/Mbed-TLS/mbedtls/pull/5624

This is just adding the ChangeLog entry for that fix.

Signed-off-by: Manuel Pégourié-Gonnard <4ba0d615aeeda88e422ca8fba28fe2938485facf@arm.com>

ARMmbed/mbedtls,Mbed-TLS/mbedtls,Mbed-TLS/mbedtls,ARMmbed/mbedtls,Mbed-TLS/mbedtls,ARMmbed/mbedtls,ARMmbed/mbedtls,Mbed-TLS/mbedtls