not need venv

.github/workflows/test_win64.yaml

@@ -39,10 +39,11 @@ jobs:
           $curDir = Get-Location
           Write-Host "Test python version"
           python -V
-          Write-Host "Create venv and install OQ form master and mbtk from branch ${{ github.ref_name }}"
-          python -m venv .\win_test
-          .\win_test\bin\Activate.ps1
-          pip install -U pip
+          Write-Host "Install OQ form master and mbtk from branch ${{ github.ref_name }}"
+          python -m pip install -U pip
+          git clone -d 1 -b master https://github.com/gem/oq-engine.git
+          python -m pip install -r oq-engine/requirements-py311-win64.txt
+          python -m pip install -e /oq-engine/
           #.\windows\install_oqmbtk.ps1 -mbtk_branch ${{ github.ref_name }}
           # do not use powershell scripts but install with devel installation
           #$MYPATH = $HOME + "\mbtk"