minor changes

Author: dmitry-shibanov

.github/workflows/build-python-packages.yml

@@ -83,8 +83,8 @@ jobs:
       - name: Prepare matrix
         shell: pwsh
         run: |
-          Write-Host ${{ needs.generate_matrix.outputs.matrix }}
-          $matrix = ${{ needs.generate_matrix.outputs.matrix }}
+          Write-Host "${{ needs.generate_matrix.outputs.matrix }}""
+          $matrix = "${{ needs.generate_matrix.outputs.matrix }}" | ConvertTo-Json -Compress -AsArray
           Write-Host matrix is $matrix
           $matrix.data.entities = $matrix.data.entities | Where-Object {$_.arch -NotMatch "arm64" -and $_.os -NotMatch "windows-2019"}
           Write-Host matrix after changes is $matrix