Bump pytest-xdist in /internal/buildscripts/packaging/tests (#217)

Bumps [pytest-xdist](https://github.com/pytest-dev/pytest-xdist) from 2.1.0 to 2.2.1.
- [Release notes](https://github.com/pytest-dev/pytest-xdist/releases)
- [Changelog](https://github.com/pytest-dev/pytest-xdist/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest-xdist@v2.1.0...v2.2.1)

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

internal/buildscripts/packaging/tests/requirements.txt

@@ -1,4 +1,4 @@
 docker==4.4.4
 pytest==6.1.1
 pytest-html==3.1.1
-pytest-xdist==2.1.0
+pytest-xdist==2.2.1