labgrid_test with py_binary fails on QEMU

labgrid_test is broken on QEMU when src is a py_binary. It fails with:

/tmp/tmp.NrtOadVR5q/execroot/inner.runfiles/rules_python~~python~python_3_11_x86_64-unknown-linux-gnu/bin/python3: can't open file '/tmp/tmp.NrtOadVR5q/execroot/inner.runfiles/%stage2_bootstrap%': [Errno 2] No such file or directory

Here's a reproduction:

py_binary(
    name = "inner",
    srcs = ["test.py"],
    main = "test.py",
)

labgrid_test(
    name = "test",
    src = ":inner",
    platform = "@rules_labgrid//platform:qemu-amd64-linux",
)