package: upgrade ESLint to v9

[ren-yamanashi]

Describe the feature

NOTE: Please note that this proposal is not a feature request , but a change request 🙏
(I could not determine which issue template to propose, so I am proposing a fetrure request...)

Currently v7 of ESLint is used in this repository, but v7 and v8 are now past EOL and should be updated to v9.

see: https://eslint.org/blog/2024/09/eslint-v8-eol-version-support/

Also, v9 changes the way configuration files are written, so I think it is better to write them in flatConfig.
(By specifying environment variables, it is possible to write the configuration file in v9 as it has been written so far (config), but in v10, only flatConfig is fully functional, so it is considered better to change it to flatConfig.

see: https://eslint.org/blog/2023/10/flat-config-rollout-plans/

Use Case

Because ESLint v7 is past EOL.

Proposed Solution

No response

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

CDK version used

2.166.0

Environment details (OS name and version, etc.)

macOS Sonoma v14.0

[ren-yamanashi]

Oops, this issue may not be necessary since the following MR was submitte

#32573

[khushail]

Thanks for linking the action item which is being worked on @ren-yamanashi.

Marking it as duplicate. Closing this as its already in progress. Please feel free to reopen if not implemented

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