Bump GitVersion.MsBuild from 5.8.1 to 6.6.1

---
updated-dependencies:
- dependency-name: GitVersion.MsBuild
  dependency-version: 6.6.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

Directory.Packages.props

@@ -4,7 +4,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageVersion Include="GitVersion.MsBuild" Version="5.8.1" />
+    <PackageVersion Include="GitVersion.MsBuild" Version="6.6.1" />
     <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="10.0.201" />
     <PackageVersion Include="xunit.v3" Version="3.2.2" />
   </ItemGroup>

src/packages.lock.json

@@ -4,9 +4,9 @@
     ".NETStandard,Version=v2.0": {
       "GitVersion.MsBuild": {
         "type": "Direct",
-        "requested": "[5.8.1, )",
-        "resolved": "5.8.1",
-        "contentHash": "WR+50tZK/ZO51RhcNObEZyIN+b7jt6YQOnUdrnkDhi+kPWm00TLXIUci2hGIgE617iaWdkbmkleBbIFwPhH0oQ=="
+        "requested": "[6.6.1, )",
+        "resolved": "6.6.1",
+        "contentHash": "jlFwpS0dzyX1cL2My5hHGsgiy+7C62Nt2t3Gf/EsWQfzO9Vs8ptFVev9pqdzo+q4qwQzB7O9OHHsuKdylgjKuw=="
       },
       "Microsoft.SourceLink.GitHub": {
         "type": "Direct",

tests/packages.lock.json

@@ -4,9 +4,9 @@
     "net10.0": {
       "GitVersion.MsBuild": {
         "type": "Direct",
-        "requested": "[5.8.1, )",
-        "resolved": "5.8.1",
-        "contentHash": "WR+50tZK/ZO51RhcNObEZyIN+b7jt6YQOnUdrnkDhi+kPWm00TLXIUci2hGIgE617iaWdkbmkleBbIFwPhH0oQ=="
+        "requested": "[6.6.1, )",
+        "resolved": "6.6.1",
+        "contentHash": "jlFwpS0dzyX1cL2My5hHGsgiy+7C62Nt2t3Gf/EsWQfzO9Vs8ptFVev9pqdzo+q4qwQzB7O9OHHsuKdylgjKuw=="
       },
       "Microsoft.SourceLink.GitHub": {
         "type": "Direct",