test: update formidable to v3

[mxschmitt]

This fixes a Dependabot Security alert and updates formidable to the latest version.

The reason for this disableRequestBodyConsumption logic is that our TestServer reads the request body in _onRequest but the formidable library attaches the 'data' handlers too late after await this.writeHeaders - this causes that the TestServer is consuming formidable's 'data' events.

One alternative which I considered is making onRequest async, awaiting the handler.call(null, request, response); call and attaching the 'data' request handlers afterwards. This seems to work in a local experiment.

Another alternative is changing postBody to a function which does the same what its doing right now but adds the 'data' event listeners when its called and requires the callee to run it inside a setRoute callback so the request is not done/ended yet. I think that is a viable solution as well.

Resolves #35823
Closes #35797

[github-actions]

Test results for "tests 1"

1 failed
❌ [firefox-page] › page/page-evaluate.spec.ts:424:3 › should throw for too deep reference chain @firefox-ubuntu-22.04-node18

5 flaky

⚠️ [firefox-library] › library/inspector/cli-codegen-1.spec.ts:986:7 › cli codegen › should not throw csp directive violation errors @firefox-ubuntu-22.04-node18
⚠️ [webkit-library] › library/browsercontext-device.spec.ts:45:5 › device › should scroll to click @webkit-ubuntu-22.04-node18
⚠️ [webkit-library] › library/ignorehttpserrors.spec.ts:30:3 › should isolate contexts @webkit-ubuntu-22.04-node18
⚠️ [playwright-test] › ui-mode-test-output.spec.ts:80:5 › should show console messages for test @windows-latest-node18-1
⚠️ [playwright-test] › ui-mode-test-watch.spec.ts:145:5 › should watch all @windows-latest-node18-1

39118 passed, 803 skipped
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Merge workflow run.