Bump tmp and exceljs in /src/ElectronNET.WebApp/ElectronHostHook

Bumps [tmp](https://github.com/raszi/node-tmp) to 0.2.7 and updates ancestor dependency [exceljs](https://github.com/exceljs/exceljs). These dependencies need to be updated together.


Updates `tmp` from 0.1.0 to 0.2.7
- [Changelog](https://github.com/raszi/node-tmp/blob/master/CHANGELOG.md)
- [Commits](raszi/node-tmp@v0.1.0...v0.2.7)

Updates `exceljs` from 1.15.0 to 4.4.0
- [Release notes](https://github.com/exceljs/exceljs/releases)
- [Commits](exceljs/exceljs@v1.15.0...v4.4.0)

---
updated-dependencies:
- dependency-name: tmp
  dependency-version: 0.2.7
  dependency-type: indirect
- dependency-name: exceljs
  dependency-version: 4.4.0
  dependency-type: direct:production
...

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Author: dependabot[bot]