Hotfix: Pulsar v1.107.1

Hotfix for important cosmetic issues in the bundled github package.
This package missed updates to be compatible with the breaking changes in Less Style Sheet syntax, and needed to be updated to preserve the intended styling of the GitHub and Git panes.

Includes this PR: #639 to fix this issue: #638

See the v1.107.0 release for all the other changes since v1.106.0.