4.13.13 - Refine UC Mode and update pytest-xdist

Refine UC Mode and update pytest-xdist

• Make refinements to UC Mode (--uc)
  --> 1757ef2
  --> This resolves issues with tests that use multiple tabs in UC Mode
• Also refresh Python dependencies (pytest-xdist)
  --> 100f473
  --> This resolves a pytest-xdist issue with using --dist=worksteal in multithreaded mode.
  --> (Details: pytest-dev/pytest-xdist#884)

What's Changed

• Refine UC Mode and update pytest-xdist by @mdmintz in #1801

Full Changelog: v4.13.12...v4.13.13