fix: package.json to reduce vulnerabilities
fix: package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/npm:mime:20170907

Latest report for thorium-sim/thorium:
https://snyk.io/test/github/thorium-sim/thorium
Thorium-Sim/thorium,Thorium-Sim/thorium,Thorium-Sim/thorium,Thorium-Sim/thorium