fix(ci): Update GitVersion to 6.x for compatibility with gittools/actions@v4 (#43)

* Initial plan

* fix(ci): Update GitVersion from 5.x to 6.x to fix install error

Co-authored-by: JerrettDavis <[email protected]>

---------

Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: JerrettDavis <[email protected]>

Author: Copilot

.github/workflows/ci.yml

@@ -120,7 +120,7 @@ jobs:
       - name: Install GitVersion
         uses: gittools/actions/gitversion/setup@v4
         with:
-          versionSpec: '5.x'
+          versionSpec: '6.x'
 
       - name: Run GitVersion
         id: gitversion