Fix for 2 vulnerable dependency paths
Fix for 2 vulnerable dependency paths

cozy-data-system currently has a 11 vulnerable dependency paths, introducing 6 different types of known vulnerabilities.

This PR fixes vulnerable dependencies.
* [ReDOS vulnerability](https://snyk.io/vuln/npm:tough-cookie:20160722) in the `tough-cookie` dependency.
* [remote memory exposure ](https://snyk.io/vuln/npm:request:20160119) vulnerability in the `request` dependency.

You can see [Snyk test report](https://snyk.io/test/github/cozy/cozy-data-system) of this project for details. 

This PR changes `Package.json` to upgrade `request` to the newer 2.74.0 version, and will fix the vulnerability listed above.

You can get alerts and fix PRs for future vulnerabilities for free by [watching this repo with Snyk](https://snyk.io/add).

Note this PR fixes all the vulnerabilities introduced trough `request` dependency, in order to be vulnerability free you will need to upgradeotherss dependencies as well.

Stay Secure,
The Snyk Team
cozy/cozy-data-system,nono/cozy-data-system