v1.12.3
Test extensions of "parent" dependencies
make loading work with a `entryfile` entry in the manifest file (#53939)
allow `-m` to run the entry point in a submodule (#55265)
Fix `--project=@script` when outside script directory (#56351)
allow specifying projects in a workspace more than one level under it (#59849)
allow finding stdlibs that are normal packages in the manifest but are now stdlibs (#60061)
Revert "Merge pull request #26139 from JuliaLang/sk/checked-out"
Pkg3-style code loading, DEPOT_PATH, tests