USN-5089-2: ca-certificates update

USN-5089-2: ca-certificates update

USN-5089-1 updated ca-certificates. This update provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.

Original advisory details:

The ca-certificates package contained a CA certificate that will expire on
2021-09-30 and will cause connectivity issues. This update removes the
“DST Root CA X3” CA.
Source: USN-5089-2: ca-certificates update