fix(core): update import path to relative path style to remove compilation error in angular

[touhidrahman]

When using @logicflow/core@2.0.4 with Angular v18 project, the angular compiler throws the following error:

✘ [ERROR] TS2307: Cannot find module 'src/model' or its corresponding type declarations. [plugin angular-compiler]

    node_modules/@logicflow/core/lib/util/graph.d.ts:1:32:
      1 │ import { EditConfigModel } from 'src/model';

This is because, for this particular file the import path was not given in relative style. This PR fixes this minor issue.

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Latest commit: ecb4c9db620bb119ad454082095781869a393f68

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[boyongjiong]

Thanks for your PR, and welcome to continue to participate and contribute. 🎉