Disable vs16.11 loc updates (#6826)
Disable vs16.11 loc updates (#6826)

OneLoc requires the onelocbuild.yml script be run, but
this script should only run for a single branch. Updating
the script to only run on `main`, effectively disabling the script
on the vs16.11 branch. https://aka.ms/allaboutloc
AndyGerlicher/msbuild,AndyGerlicher/msbuild,sean-gilliam/msbuild,AndyGerlicher/msbuild,rainersigwald/msbuild,AndyGerlicher/msbuild,rainersigwald/msbuild,sean-gilliam/msbuild,rainersigwald/msbuild,sean-gilliam/msbuild,sean-gilliam/msbuild,rainersigwald/msbuild