Add missing pytest-xdist package to list of installing packages

Author: antonwolfy

.github/workflows/conda-package.yml

@@ -198,7 +198,7 @@ jobs:
       - name: ReInstall dpnp
         if: steps.install_dpnp.outcome == 'failure'
         run: |
-          mamba install ${{ env.package-name }}=${{ env.PACKAGE_VERSION }} pytest python=${{ matrix.python }} ${{ env.TEST_CHANNELS }}
+          mamba install ${{ env.package-name }}=${{ env.PACKAGE_VERSION }} pytest pytest-xdist python=${{ matrix.python }} ${{ env.TEST_CHANNELS }}
         env:
           TEST_CHANNELS: '-c ${{ env.channel-path }} ${{ env.channels-list }}'