deps: Bump the microsoft group with 3 updates (#115)

Bumps Microsoft.Build.Framework from 18.3.3 to 18.4.0
Bumps Microsoft.Build.Utilities.Core from 18.3.3 to 18.4.0
Bumps Microsoft.NET.StringTools from 18.3.3 to 18.4.0

---
updated-dependencies:
- dependency-name: Microsoft.Build.Framework
  dependency-version: 18.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: microsoft
- dependency-name: Microsoft.Build.Utilities.Core
  dependency-version: 18.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: microsoft
- dependency-name: Microsoft.NET.StringTools
  dependency-version: 18.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: microsoft
...

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Author: dependabot[bot]