chore(iam): update dependencies

[angelcaamal]

Description

Fixes Internal: b/556287655

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Checklist

• I have followed guidelines from CONTRIBUTING.MD and Samples Style Guide
• Tests pass: npm test (see Testing)
• Lint pass: npm run lint (see Style)
• Required CI tests pass (see CI testing)
• These samples need a new API enabled in testing projects to pass (let us know which ones)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• This pull request is from a branch created directly off of GoogleCloudPlatform/nodejs-docs-samples. Not a fork.
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new sample directory, and I created GitHub Actions workflow for this sample
• This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• Please merge this PR for me once it is approved

Note: Any check with (dev), (experimental), or (legacy) can be ignored and should not block your PR from merging (see CI testing).

[gemini-code-assist]

Code Review

This pull request updates dependencies in iam/deny/package.json, including upgrading @google-cloud/iam, c8, and chai. Feedback points out that upgrading chai to ^6.0.0 will break tests because Chai v5 and above are ESM-only, whereas this project is configured as CommonJS. It is recommended to revert chai to ^4.5.0 to maintain compatibility.

[gemini-code-assist]

Chai v5 and above are ESM-only. Since this project is configured as CommonJS (using require and lacking "type": "module" in package.json), upgrading to chai v6 will cause tests to fail with ERR_REQUIRE_ESM errors. Please keep chai at ^4.5.0 to maintain CommonJS compatibility.

Suggested change

	"chai": "^6.0.0",
	"chai": "^4.5.0",