chore: checkout submodules with shallow=true
[submodule "std/wasi/testdata"]
path = std/wasi/testdata
url = https://github.com/khronosproject/wasi-test-suite.git
+ shallow = true
[submodule "test_util/wpt"]
path = test_util/wpt
url = https://github.com/web-platform-tests/wpt.git
+ shallow = true
