Update dependency request to v2.88.0

Author: renovate[bot]

functions/background/package.json

@@ -17,7 +17,7 @@
     "test": "ava -T 20s --verbose test/*.test.js"
   },
   "dependencies": {
-    "request": "2.83.0",
+    "request": "2.88.0",
     "request-promise-native": "^1.0.5"
   },
   "devDependencies": {

functions/gcs/package.json

@@ -18,7 +18,7 @@
   },
   "dependencies": {
     "@google-cloud/storage": "1.7.0",
-    "request": "2.83.0"
+    "request": "2.88.0"
   },
   "devDependencies": {
     "@google-cloud/nodejs-repo-tools": "^3.0.0",