Release v1.15.10

See kubernetes-announce@ and CHANGELOG-1.15.md for details.

SHA256 for kubernetes.tar.gz: d1a83cff0957be007fc83cd1c0c12539b3500b52e5be564e01f711d73edf239b SHA512 for kubernetes.tar.gz: 92b18c5b54b10772ba22e10205242fbb565aeb3b4e9ff9c732caa6ebc4bca65665b09187e8e96341905f233372944a178ffb14c1f6313d3975e4c94f8a2ef29d

Additional binary downloads are linked in the CHANGELOG-1.15.md.