downgrade to logger 1.9.1

investigating possible regression in 2.2.0

services/document-updater/package.json

@@ -23,7 +23,7 @@
     "bunyan": "~0.22.1",
     "express": "4.17.1",
     "lodash": "^4.17.19",
-    "logger-sharelatex": "^2.2.0",
+    "logger-sharelatex": "^1.9.1",
     "metrics-sharelatex": "^2.6.2",
     "mongodb": "^3.6.0",
     "redis-sharelatex": "^1.0.13",