Upgrade build-scripts to 3.4.0

This version fixes docker-compose health checks for dependent services. See
https://github.com/overleaf/dev-environment/pull/409 for details.

services/document-updater/docker-compose.ci.yml

@@ -20,6 +20,7 @@ services:
     environment:
       ELASTIC_SEARCH_DSN: es:9200
       REDIS_HOST: redis
+      QUEUES_REDIS_HOST: redis
       MONGO_HOST: mongo
       POSTGRES_HOST: postgres
       MOCHA_GREP: ${MOCHA_GREP}
@@ -43,6 +44,14 @@ services:
     user: root
   redis:
     image: redis
+    healthcheck:
+      test: ping="$$(redis-cli ping)" && [ "$$ping" = 'PONG' ]
+      interval: 1s
+      retries: 20
 
   mongo:
     image: mongo:4.0
+    healthcheck:
+      test: "mongo --quiet localhost/test --eval 'quit(db.runCommand({ ping: 1 }).ok ? 0 : 1)'"
+      interval: 1s
+      retries: 20