Bump YamlDotNet from 6.1.2 to 7.0.0

Bumps [YamlDotNet](https://github.com/aaubry/YamlDotNet) from 6.1.2 to 7.0.0.
- [Release notes](https://github.com/aaubry/YamlDotNet/releases)
- [Changelog](https://github.com/aaubry/YamlDotNet/blob/master/RELEASE_NOTES.md)
- [Commits](aaubry/YamlDotNet@v6.1.2...v7.0.0)

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

Author: dependabot-preview[bot]

src/Directory.Build.props

@@ -16,7 +16,7 @@
  <PropertyGroup>
     <PackageVersion_LibGit2Sharp>0.26.1</PackageVersion_LibGit2Sharp>
     <PackageVersion_JetBrainsAnnotations>2019.1.3</PackageVersion_JetBrainsAnnotations>
-    <PackageVersion_YamlDotNet>6.1.2</PackageVersion_YamlDotNet>
+    <PackageVersion_YamlDotNet>7.0.0</PackageVersion_YamlDotNet>
     <PackageVersion_NewtonsoftJson>12.0.2</PackageVersion_NewtonsoftJson>
 
     <PackageVersion_MicrosoftTestSdk>16.3.0</PackageVersion_MicrosoftTestSdk>