bump to v1.0.0-alpha4

bump to v1.0.0-alpha3

bump to v1.0.0-alpha2

update UM protos

bump v0.9.1

bump to v0.9.0

fix regression with ClientPlayingSessionState

bump to v0.8.19

bump to v0.8.18

[skip ci]

docs: remove references to [client] extra

[ci skip]