fix: correct inconsistency at .env.sepolia

[alkindivv]

Updated OP_RETH_OP_NETWORK from "base" to "base-sepolia"

This maintains consistency with other sepolia-related variables:
RETH_CHAIN=base-sepolia
OP_NODE_NETWORK=base-sepolia
OP_GETH_OP_NETWORK=base-sepolia

[cb-heimdall]

✅ Heimdall Review Status

Requirement	Status	More Info
Reviews	✅ 1/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 1 Sum 2

[danyalprout]

thanks!

[cb-heimdall]

Review Error for danyalprout @ 2025-10-08 17:36:35 UTC
User failed mfa authentication, either user does not exist or public email is not set on your github profile. \ see go/mfa-help