[CI] Chrome/Puppeteer testing broken in GCB

[gino-m]

Test step fails with:

> ground@0.0.0 test /workspace/web-ng
> ng test --browsers ChromeHeadlessNoSandbox --watch=false

    WARNING: Zone.js does not support native async/await in ES2017.
    These blocks are not intercepted by zone.js and will not triggering change detection.
    See: https://github.com/angular/zone.js/pull/1140 for more information.
14 09 2020 20:10:51.296:INFO [karma-server]: Karma v5.0.9 server started at http://0.0.0.0:9876/
14 09 2020 20:10:51.320:INFO [launcher]: Launching browsers ChromeHeadlessNoSandbox with concurrency unlimited
14 09 2020 20:10:51.324:INFO [launcher]: Starting browser ChromeHeadless
14 09 2020 20:10:51.698:ERROR [launcher]: Cannot start ChromeHeadless
	/workspace/web-ng/node_modules/puppeteer/.local-chromium/linux-756035/chrome-linux/chrome: error while loading shared libraries: libXss.so.1: cannot open shared object file: No such file or directory

Possibly related to puppeteer/puppeteer#6192