protos: Update to latest version from remote-apis

This includes the REAPI v2.3 clarification on Command.arguments[0] semantics.

The API change in generated code caused by https://github.com/bazelbuild/remote-apis/pull/205 breaks the build of buildbox-casd and thus, the e2e CI job fails. This branch enables allow_failure for the e2e job to allow this transition to happen (this CI flag used to be enabled for the old e2e job).

buildbox-casd!270 (merged) should be merged as soon as possible after merging this MR.