Bump aws-sdk from 2.1473.0 to 2.1478.0 in /lambda (#437)

Bumps [aws-sdk](https://github.com/aws/aws-sdk-js) from 2.1473.0 to 2.1478.0.
- [Release notes](https://github.com/aws/aws-sdk-js/releases)
- [Commits](aws/aws-sdk-js@v2.1473.0...v2.1478.0)

---
updated-dependencies:
- dependency-name: aws-sdk
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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lambda/package.json

@@ -1,7 +1,7 @@
 {
   "license": "UNLICENSED",
   "dependencies": {
-    "aws-sdk": "2.1473.0"
+    "aws-sdk": "2.1478.0"
   },
   "devDependencies": {
     "@fun-stack/fun-pack": "0.3.5"