Fix FTBFS in test

The tests were failing because of invalid testdata certs. This patch fixes the validity of the certs. Patch has been picked from upstream Debian package and the same is part of the package in Debian Unstable

Fixes: https://phabricator.apertis.org/T6384

Signed-off-by: Ritesh Raj Sarraf ritesh.sarraf@collabora.com