chore: update celo testnet to use sepolia instead of deprecated alfajores

[evgeniko]

https://docs.celo.org/infra-partners/notices/celo-sepolia-launch

Summary by CodeRabbit

• Chores
  • Updated Celo testnet infrastructure configuration including explorer URL, RPC endpoint, and chain identifier to align with new testnet infrastructure.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

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📝 Walkthrough

Walkthrough

Updates Celo testnet configuration constants from Alfajores to Celo Sepolia, including the explorer base URL, native chain ID, and RPC endpoint across three configuration files in the base constants module.

Changes

Cohort / File(s)	Summary
Celo Testnet Configuration Migration core/base/src/constants/explorer.ts, core/base/src/constants/nativeChainIds.ts, core/base/src/constants/rpc.ts	Updated Celo testnet endpoints and identifiers: explorer URL changed from alfajores to sepolia.celoscan.io, native chain ID updated from 44787n to 11142220n, and RPC URL migrated from alfajores-forno to forno.celo-sepolia.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

🐰 Hop along to Sepolia's green,
Where Celo testnet's now been seen,
Chain IDs and endpoints dance anew,
Alfajores bid adieu, adieu!
New explorers light our way through.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: updating Celo testnet configuration from the deprecated Alfajores to Sepolia across multiple constant files.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch celo_sepolia

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[kev1n-peters]

Are there any wormhole contracts deployed on Celo Sepolia? If we merged this change as is, then the places where the contract addresses are hard-coded for Celo testnet will not exist on Sepolia (if they don't actually exist)