Bump underscore and azure-storage

Bumps [underscore](https://github.com/jashkenas/underscore) to 1.13.6 and updates ancestor dependency [azure-storage](https://github.com/Azure/azure-storage-node). These dependencies need to be updated together.


Updates `underscore` from 1.8.3 to 1.13.6
- [Commits](jashkenas/underscore@1.8.3...1.13.6)

Updates `azure-storage` from 2.10.3 to 2.10.7
- [Release notes](https://github.com/Azure/azure-storage-node/releases)
- [Changelog](https://github.com/Azure/azure-storage-node/blob/master/ChangeLog.md)
- [Commits](https://github.com/Azure/azure-storage-node/commits)

---
updated-dependencies:
- dependency-name: underscore
  dependency-type: indirect
- dependency-name: azure-storage
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>