fix(dmg-builder): the "import" unbound issue

[pan93412]

Fix #6606

python3 can't run our modified script since it can't find reload properly:

As executePython("python3") failed, it fellback to executePython("python") and fail:

NestedError: Cannot cleanup: 

Error #1 --------------------------------------------------------------------------------
Error: Exit code: ENOENT. spawn /usr/bin/python ENOENT
    at /Users/pan93412/Projects/YesPlayMusic/node_modules/builder-util/src/util.ts:133:18
    at exithandler (node:child_process:406:5)
    at ChildProcess.errorhandler (node:child_process:418:5)
    at ChildProcess.emit (node:events:520:28)
    at Process.ChildProcess._handle.onexit (node:internal/child_process:289:12)
    at onErrorNT (node:internal/child_process:478:16)
    at processTicksAndRejections (node:internal/process/task_queues:83:21)

Error #2 --------------------------------------------------------------------------------
Error: Exit code: ENOENT. spawn /usr/bin/python ENOENT
    at /Users/pan93412/Projects/YesPlayMusic/node_modules/builder-util/src/util.ts:133:18
    at exithandler (node:child_process:406:5)
    at ChildProcess.errorhandler (node:child_process:418:5)
    at ChildProcess.emit (node:events:520:28)
    at Process.ChildProcess._handle.onexit (node:internal/child_process:289:12)
    at onErrorNT (node:internal/child_process:478:16)
    at processTicksAndRejections (node:internal/process/task_queues:83:21)
    at throwError (/Users/pan93412/Projects/YesPlayMusic/node_modules/builder-util/src/asyncTaskManager.ts:88:11)
    at checkErrors (/Users/pan93412/Projects/YesPlayMusic/node_modules/builder-util/src/asyncTaskManager.ts:53:9)
    at AsyncTaskManager.awaitTasks (/Users/pan93412/Projects/YesPlayMusic/node_modules/builder-util/src/asyncTaskManager.ts:58:5)
    at Packager.doBuild (/Users/pan93412/Projects/YesPlayMusic/node_modules/app-builder-lib/src/packager.ts:453:23)
    at Object.executeFinally (/Users/pan93412/Projects/YesPlayMusic/node_modules/builder-util/src/promise.ts:12:14)
    at Packager._build (/Users/pan93412/Projects/YesPlayMusic/node_modules/app-builder-lib/src/packager.ts:376:31)
    at Packager.build (/Users/pan93412/Projects/YesPlayMusic/node_modules/app-builder-lib/src/packager.ts:337:12)
    at Object.executeFinally (/Users/pan93412/Projects/YesPlayMusic/node_modules/builder-util/src/promise.ts:12:14)
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

[changeset-bot]

🦋 Changeset detected

Latest commit: e5e8a72

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 7 packages

Name	Type
dmg-builder	Patch
electron-builder	Patch
electron-builder-squirrel-windows	Patch
electron-forge-maker-appimage	Patch
electron-forge-maker-nsis-web	Patch
electron-forge-maker-nsis	Patch
electron-forge-maker-snap	Patch

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[pan93412]

r? @mmaietta