Merge branch 'release-v2.13.1' into develop

* release-v2.13.1:
  Bumping version to v2.13.1
Corrected erroneous test failures in Cloudsearch post-move to SigV4.
Finalized the release notes.

Mynd you, møøse bites Kan be pretty nasti...
Bumping version to v2.13.2
Merge branch 'release-v2.13.2'

* release-v2.13.2:
  Bumping version to v2.13.2
  Finalized the release notes.
  Corrected erroneous test failures in Cloudsearch post-move to SigV4.