Bump GitVersion.MsBuild from 6.7.0 to 6.8.0

---
updated-dependencies:
- dependency-name: GitVersion.MsBuild
  dependency-version: 6.8.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Directory.Packages.props

@@ -7,7 +7,7 @@ SPDX-License-Identifier: MIT
 <Project>
   <ItemGroup>
     <!-- all -->
-    <PackageVersion Include="GitVersion.MsBuild" Version="6.7.0" />
+    <PackageVersion Include="GitVersion.MsBuild" Version="6.8.0" />
     <!-- SqliteTimestamp -->
     <PackageVersion Include="Microsoft.EntityFrameworkCore.Sqlite" Version="10.0.9" />
     <!-- unit tests -->