Build fail because of event-stream/rules_sass

[shikanime]

Since the recent dominictarr/event-stream#116 issue the current rules_sass (1.15.1) doesn't work anymore and need to be downgrade because rules_sass seem to not having patch (or didn't found).

ERROR: Analysis of target '//src:prodserver' failed; build aborted: no such package '@matdeps//tslib': yarn_install failed: yarn install
 v1.9.2
$ node ./tools/npm/check-npm.js
[1/5] Validating package.json...
[2/5] Resolving packages...
[3/5] Fetching packages...
info If you think this is a bug, please open a bug report with the information provided in "/private/var/tmp/_bazel_williamphetsinorath/ac9eeaa50bdad014dedfbdf910c8977c/external/matdeps/yarn-error.log".
info Visit https://yarnpkg.com/en/docs/cli/install for documentation about this command.
 ((node:60094) [DEP0005] DeprecationWarning: Buffer() is deprecated due to security and usability issues. Please use the Buffer.alloc(), Buffer.allocUnsafe(), or Buffer.from() methods instead.
error An unexpected error occurred: "https://registry.yarnpkg.com/event-stream/-/event-stream-3.3.6.tgz: Request failed \"404 Not Found\"".
)
INFO: Elapsed time: 5.568s
INFO: 0 processes.
FAILED: Build did NOT complete successfully (1 packages loaded, 3065 targets configured)
FAILED: Build did NOT complete successfully (1 packages loaded, 3065 targets configured)

[gregmagolan]

Thanks. Duplicate of #257.