Log Message:
shells/oh-my-posh: update to 21.27.0

v21.27.0
Bug Fixes
 - terminal: calculate length correctly (4b5bac3)

Features
 - install: use user-writable installation directories by default (55113b8), \ 
closes #5284

v21.26.4
Bug Fixes
 - pwsh: restore prompt function override (024c8b6)