Update Microsoft.WSLg to 1.0.77 (#40568)

Picks up the fix for GUI app icons disappearing from the Start menu on Azure Linux 3 system distros. The system distro upgrade in WSLg 1.0.72 brought in librsvg 2.58, which lazily spawns a rayon thread pool the first time it has to render a complex SVG icon. Those worker threads share fs_struct with weston's app-list enumeration thread and break the subsequent setns(CLONE_NEWNS) into the user distro's mount namespace, causing every app processed after the first complex-icon one to fall off the Start menu. Fixed in microsoft/weston-mirror#162; rolled into Microsoft.WSLg 1.0.77. Fixes microsoft/wslg#1444 Fixes #40538 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>