[misc] install bunyan as production dependency

```
Error: Cannot find module 'bunyan'
Require stack:
- .../node_modules/@google-cloud/logging-bunyan/build/src/middleware/express.js
- .../node_modules/@google-cloud/logging-bunyan/build/src/index.js
- .../node_modules/logger-sharelatex/logging-manager.js
- .../node_modules/logger-sharelatex/index.js
- .../app.js
```

services/document-updater/package-lock.json

@@ -1540,7 +1540,7 @@
     "browser-stdout": {
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/browser-stdout/-/browser-stdout-1.3.1.tgz",
-      "integrity": "sha512-qhAVI1+Av2X7qelOfAIYwXONood6XlZE/fXaBSmW/T5SzLAmCgzi+eiWE7fUvbHaeNBQH13UftjpXxsfLkMpgw==",
+      "integrity": "sha1-uqVZ7hTO1zRSIputcyZGfGH6vWA=",
       "dev": true
     },
     "bson": {
@@ -1564,20 +1564,14 @@
       "integrity": "sha512-lGzLKcioL90C7wMczpkY0n/oART3MbBa8R9OFGE1rJxoVI86u4WAGfEk8Wjv10eKSyTHVGkSo3bvBylCEtk7LA=="
     },
     "bunyan": {
-      "version": "0.22.3",
-      "resolved": "https://registry.npmjs.org/bunyan/-/bunyan-0.22.3.tgz",
-      "integrity": "sha1-ehncG0yMZF90AkGnQPIkUUfGfsI=",
+      "version": "1.8.15",
+      "resolved": "https://registry.npmjs.org/bunyan/-/bunyan-1.8.15.tgz",
+      "integrity": "sha512-0tECWShh6wUysgucJcBAoYegf3JJoZWibxdqhTm7OHPeT42qdjkZ29QCMcKwbgU1kiH+auSIasNRXMLWXafXig==",
       "requires": {
-        "dtrace-provider": "0.2.8",
-        "mv": "~2"
-      },
-      "dependencies": {
-        "dtrace-provider": {
-          "version": "0.2.8",
-          "resolved": "https://registry.npmjs.org/dtrace-provider/-/dtrace-provider-0.2.8.tgz",
-          "integrity": "sha512-wufYnYt4ISHnT9MEiRgQ3trXuolt7mICTa/ckT+KYHR667K9H82lmI8KM7zKUJ8l5I343A34wJnvL++1TJn1iA==",
-          "optional": true
-        }
+        "dtrace-provider": "~0.8",
+        "moment": "^2.19.3",
+        "mv": "~2",
+        "safe-json-stringify": "~1"
       }
     },
     "bytes": {
@@ -6566,7 +6560,7 @@
     "stubs": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/stubs/-/stubs-3.0.0.tgz",
-      "integrity": "sha512-PdHt7hHUJKxvTCgbKX9C1V/ftOcjJQgz8BZwNfV5c4B6dcGqlpelTbJ999jBGZ2jYiPAwcX5dP6oBwVlBlUbxw=="
+      "integrity": "sha1-6NK6H6nJBXAwPAMLaQD31fiavls="
     },
     "supports-color": {
       "version": "5.4.0",

services/document-updater/package.json

@@ -23,7 +23,7 @@
     "@overleaf/redis-wrapper": "^2.0.1",
     "async": "^2.5.0",
     "body-parser": "^1.19.0",
-    "bunyan": "~0.22.1",
+    "bunyan": "^1.8.15",
     "diff-match-patch": "https://github.com/overleaf/diff-match-patch/archive/89805f9c671a77a263fc53461acd62aa7498f688.tar.gz",
     "express": "4.17.1",
     "lodash": "^4.17.21",