Bump follow-redirects from 1.15.2 to 1.15.6 in /checkUrlExists/lambda

Bumps [follow-redirects](https://github.com/follow-redirects/follow-redirects) from 1.15.2 to 1.15.6.
- [Release notes](https://github.com/follow-redirects/follow-redirects/releases)
- [Commits](follow-redirects/follow-redirects@v1.15.2...v1.15.6)

---
updated-dependencies:
- dependency-name: follow-redirects
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

checkUrlExists/lambda/package.json

@@ -8,7 +8,7 @@
   "license": "MIT",
   "dependencies": {
     "basic-ftp": "^5.0.3",
-    "follow-redirects": "^1.15.2"
+    "follow-redirects": "^1.15.6"
   },
   "scripts": {
     "test": "jasmine"