chore(contributors-action): use built in token

[erezrokah]

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Summary

Follow up to #4029

We can't use the tokens generator app as the secrets are not exposed to forked PRs.
Downside is that the action will update the package.json but won't trigger any following tests (unless a person with write permissions syncs it with main).

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[github-actions]

📊 Benchmark results

Comparing with 69f6465

Package size: 377 MB

(no change)

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Legend

• T-30 (69f6465): 377 MB
• T-29 (ac4cd23): 377 MB
• T-28 (fbd9156): 377 MB
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• T-21 (b830b8f): 377 MB
• T-20 (454e4d1): 377 MB
• T-19 (06f0d95): 377 MB
• T-18 (a1dc7a4): 368 MB
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• T-16 (127a1c6): 368 MB
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• T-14 (6424921): 368 MB
• T-13 (9902ec0): 368 MB
• T-12 (fb4fd7a): 368 MB
• T-11 (b557a4d): 368 MB
• T-10 (d7d1a83): 368 MB
• T-9 (5aada1e): 368 MB
• T-8 (db86f16): 363 MB
• T-7 (89ec45c): 363 MB
• T-6 (e6bde5b): 363 MB
• T-5 (8a59a03): 363 MB
• T-4 (501da79): 363 MB
• T-3 (c370149): 362 MB
• T-2 (0e0502c): 362 MB
• T-1 (effffec): 362 MB
• T (current commit): 377 MB