build(deps): bump aws-sdk from 2.635.0 to 2.639.0 (#11978)

Bumps [aws-sdk](https://github.com/aws/aws-sdk-js) from 2.635.0 to 2.639.0.
- [Release notes](https://github.com/aws/aws-sdk-js/releases)
- [Changelog](https://github.com/aws/aws-sdk-js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/aws/aws-sdk-js/compare/v2.635.0...v2.639.0)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

package.json

@@ -14,7 +14,7 @@
     "amplitude": "^3.5.0",
     "apidoc": "^0.17.5",
     "apn": "^2.2.0",
-    "aws-sdk": "^2.635.0",
+    "aws-sdk": "^2.639.0",
     "bcrypt": "^3.0.8",
     "body-parser": "^1.18.3",
     "compression": "^1.7.4",