minor fix

Author: dmitry-shibanov

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

@@ -84,7 +84,7 @@ jobs:
         shell: pwsh
         run: |
           Write-Host "${{ needs.generate_matrix.outputs.matrix }}"
-          $matrix = '${{ needs.generate_matrix.outputs.matrix }}'' | ConvertFrom-Json -AsHashtable
+          $matrix = '${{ needs.generate_matrix.outputs.matrix }}' | ConvertFrom-Json -AsHashtable
           Write-Host "matrix is $matrix"
           $matrixReduced = $matrix | Where-Object {$_.arch -ne "arm64" -or $_.os -ne "windows-2019"}
           Write-Host matrix after changes is $matrixReduced