chore: pin fflate@0.8.2

[mdjermanovic]

Prerequisites checklist

• I have read the contributing guidelines.

AI acknowledgment

• I did not use AI to generate this PR.
• (If the above is not checked) I have reviewed the AI-generated content before submitting.

What is the purpose of this pull request?

Similar to eslint/eslint#20877.

Fixes CI failure when running lint:types scripts:

https://github.com/eslint/rewrite/actions/runs/25950047972/job/76286009745

Run npm run lint:types

> eslint-rewrite@1.0.0 lint:types
> npm run lint:types --workspaces --if-present


> @eslint/compat@2.1.0 lint:types
> attw --pack

error while checking file:
Cannot read properties of undefined (reading 'filename')
npm error Lifecycle script `lint:types` failed with error:
npm error code 3
npm error path /home/runner/work/rewrite/rewrite/packages/compat
npm error workspace @eslint/compat@2.1.0
npm error location /home/runner/work/rewrite/rewrite/packages/compat
npm error command failed
npm error command sh -c attw --pack

...
(same for all other packages)

What changes did you make? (Give an overview)

Per arethetypeswrong/arethetypeswrong.github.io#258, the problem is caused by @arethetypeswrong/core relying on an internal behavior of fflate, which has changed in recently released v0.8.3.

As this might not be fixed soon, this PR adds overrides to pin fflate to v0.8.2 for @arethetypeswrong/core.

Related Issues

Is there anything you'd like reviewers to focus on?

[fasttime]

LGTM, thanks!