chore: rename dlcBTC to iBTC

[iherger]

Apparently this was changed on-chain, see nightly test fail: https://github.com/enzymefinance/sdk/actions/runs/12041206275

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PR-Codex overview

This PR focuses on renaming the asset dlcBTC to iBTC in two files related to the environment package.

Detailed summary

• Updated asset name from dlcBTC to iBTC in packages/environment/src/assets/arbitrum.ts.
• Updated asset symbol from dlcBTC to IBTC in packages/environment/src/assets/arbitrum.ts.
• Updated asset name from dlcBTC to iBTC in packages/environment/src/assets/ethereum.ts.
• Updated asset symbol from DLCBTC to IBTC in packages/environment/src/assets/ethereum.ts.

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[changeset-bot]

🦋 Changeset detected

Latest commit: 6a766c5

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@enzymefinance/environment	Patch

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[pkg-pr-new]

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pnpm add https://pkg.pr.new/@enzymefinance/abis@575

pnpm add https://pkg.pr.new/@enzymefinance/api@575

pnpm add https://pkg.pr.new/@enzymefinance/environment@575

pnpm add https://pkg.pr.new/@enzymefinance/sdk@575

commit: 6a766c5