Companion dependency updates (transloadit#1983)

* companion: upgrade deps with updtr

* companion: downgrade stuff for node 6 compat

* Update packages/@uppy/companion/package.json

package.json

@@ -29,40 +29,40 @@
     "companion": "./bin/companion"
   },
   "dependencies": {
-    "@purest/providers": "1.0.0",
+    "@purest/providers": "1.0.1",
     "@uppy/fs-tail-stream": "1.2.0",
-    "atob": "2.1.0",
-    "aws-sdk": "2.388.0",
-    "body-parser": "1.18.2",
+    "atob": "2.1.2",
+    "aws-sdk": "2.587.0",
+    "body-parser": "1.19.0",
     "chalk": "2.4.2",
     "common-tags": "1.8.0",
     "connect-redis": "4.0.3",
-    "cookie-parser": "1.4.3",
+    "cookie-parser": "1.4.4",
     "express": "4.17.1",
     "express-interceptor": "1.2.0",
     "express-prom-bundle": "3.3.0",
     "express-request-id": "1.4.1",
-    "express-session": "1.15.6",
+    "express-session": "1.17.0",
     "grant-express": "4.1.2",
     "helmet": "3.21.2",
     "isobject": "3.0.1",
-    "jsonwebtoken": "8.3.0",
+    "jsonwebtoken": "8.5.1",
     "lodash.merge": "4.6.2",
-    "mime-types": "2.1.24",
+    "mime-types": "2.1.25",
     "morgan": "1.9.1",
-    "ms": "2.1.1",
-    "node-redis-pubsub": "2.0.0",
-    "node-schedule": "1.3.1",
-    "prom-client": "10.2.3",
-    "purest": "3.0.0",
+    "ms": "2.1.2",
+    "node-redis-pubsub": "4.0.0",
+    "node-schedule": "1.3.2",
+    "prom-client": "11.5.3",
+    "purest": "3.1.0",
     "redis": "2.8.0",
     "request": "2.88.0",
-    "semver": "6.1.1",
+    "semver": "6.3.0",
     "serialize-error": "^2.1.0",
-    "tus-js-client": "1.8.0-2",
-    "uuid": "2.0.2",
-    "validator": "^9.0.0",
-    "ws": "3.3.1"
+    "tus-js-client": "1.8.0",
+    "uuid": "3.3.3",
+    "validator": "^12.1.0",
+    "ws": "6.2.1"
   },
   "devDependencies": {
     "@types/node": "^12.6.8",