fix: upgrade to GitVersion 6.x with gittools/actions v4 (#104)

- Update versionSpec from '5.x' to '6.x' (v4 requires >=6.1.0)
- Replace nuGetVersionV2 output with semVer (removed in v6)
- Migrate GitVersion.yml: mode: MainLine -> workflow: GitHubFlow/v1

Author: JerrettDavis

.github/workflows/ci.yml

@@ -154,15 +154,15 @@ jobs:
       - name: Install GitVersion
         uses: gittools/actions/gitversion/setup@v4
         with:
-          versionSpec: '5.x'
+          versionSpec: '6.x'
 
       - name: Run GitVersion
         id: gitversion
         uses: gittools/actions/gitversion/execute@v4
 
       - name: Set version env vars
         run: |
-          echo "PACKAGE_VERSION=${{ steps.gitversion.outputs.nuGetVersionV2 }}" >> $GITHUB_ENV
+          echo "PACKAGE_VERSION=${{ steps.gitversion.outputs.semVer }}" >> $GITHUB_ENV
           echo "ASSEMBLY_VERSION=${{ steps.gitversion.outputs.assemblySemVer }}" >> $GITHUB_ENV
           echo "FILE_VERSION=${{ steps.gitversion.outputs.assemblySemFileVer }}" >> $GITHUB_ENV
 

GitVersion.yml

@@ -1,7 +1,7 @@
-mode: MainLine
+workflow: GitHubFlow/v1
 tag-prefix: 'v'
 commit-message-incrementing: Enabled
 
 major-version-bump-message: '(?m)^[a-z]+(?:\([\w\s\-,/\\]+\))?!:|(?m)^\s*BREAKING CHANGE:'
 minor-version-bump-message: '(?m)^feat(?:\([\w\s\-,/\\]+\))?:'
-patch-version-bump-message: '(?m)^(?:fix|perf)(?:\([\w\s\-,/\\]+\))?:'
+patch-version-bump-message: '(?m)^(?:fix|perf)(?:\([\w\s\-,/\\]+\))?:'