systemd-boot-builder: use type literals

import sys

import warnings

import json

from typing import NamedTuple, Dict, List

from typing import NamedTuple, Any

from dataclasses import dataclass

# These values will be replaced with actual values during the package build

    init: str

    initrd: str

    kernel: str

    kernelParams: List[str]  # noqa: N815

    kernelParams: list[str]  # noqa: N815

    label: str

    system: str

    toplevel: str

    specialisations: Dict[str, "BootSpec"]

    specialisations: dict[str, "BootSpec"]

    sortKey: str  # noqa: N815

    initrdSecrets: str | None = None  # noqa: N815

FILE = None | int

def run(cmd: List[str], stdout: FILE = None) -> subprocess.CompletedProcess[str]:

def run(cmd: list[str], stdout: FILE = None) -> subprocess.CompletedProcess[str]:

    return subprocess.run(cmd, check=True, text=True, stdout=stdout)

class SystemIdentifier(NamedTuple):

        bootspec_json = json.loads(boot_json_str)

    return bootspec_from_json(bootspec_json)

def bootspec_from_json(bootspec_json: Dict) -> BootSpec:

def bootspec_from_json(bootspec_json: dict[str, Any]) -> BootSpec:

    specialisations = bootspec_json['org.nixos.specialisation.v1']

    specialisations = {k: bootspec_from_json(v) for k, v in specialisations.items()}

    systemdBootExtension = bootspec_json.get('org.nixos.systemd-boot', {})