Change logs for ubuntu-keyring source package in Jammy

ubuntu-keyring (2021.03.26) hirsute; urgency=medium

  * Remove expiry of the ddebs.ubuntu.com key. LP: #1920640
  * Remove previous signatures from the ddebs.ubuntu.com key to minimize
    keyring size.
  * Remove encryption subkeys from cloud-archive & cloud-images keyrings,
    only signing keys are needed.

 -- Dimitri John Ledkov <email address hidden>  Fri, 26 Mar 2021 23:37:35 +0000