Merge branch 'mbedtls-3.6.3.1-rc' into mbedtls-3.6.3.1-pr

This merge was done by the '-s ours' strategy. The only purpose of this
merge is to bring the commit for the 3.6.3.1 release into the
mbedtls-3.6 history and make the CI pass.

Signed-off-by: Janos Follath <janos.follath@arm.com>