Protocol Buffer update for release 1.7.x at Fri Oct 30 10:36:51 UTC 2020 (#1506)

* Update from https://github.com/corona-warn-app/cwa-protocol-buffers/commit/a5a77c4be423c272316b3e30206d561d8217e46f

* Update from https://github.com/corona-warn-app/cwa-protocol-buffers/commit/2cb89bb9aad80ce530e03c420942ff5a7e18b8cb

* Update from https://github.com/corona-warn-app/cwa-protocol-buffers/commit/ca2fbdfae1b1a74244659f40b1e95f877ad3432f



Co-authored-by: AlexanderAlferov <64849422+AlexanderAlferov@users.noreply.github.com>
Co-authored-by: Matthias Urhahn <matthias.urhahn@sap.com>
Co-authored-by: Ralf Gehrer <ralfgehrer@users.noreply.github.com>