Add cmark-6-2025 and update default rpc

[psparacino]

Pull Request Template

📄 Description

📝 Changelog

✅ Checklist

• Matchstick test included (if applicable).
• Version incremented in package.json of the applicable subgraph(s)
• All changes are reflected in the changelog of this PR for the applicable subgraph(s)
• If modifying polygon-digital-carbon or carbonmark subgraphs, MAKE SURE TO MODIFY subgraph.template.yaml (NOT subgraph.yaml DIRECTLY!)
  • If modifying subgraph.template.yaml, also make sure to run npm run prepare-matic locally and commit the resulting rendered subgraph.yaml

ℹ️ Additional Information