Fix malformed Docker Compose command in CONTRIBUTING.md

[CryptAm]

What

Fix the malformed Docker Compose command in CONTRIBUTING.md by adding the missing space between up and jsonrpc.

##Why

The command should use up jsonrpc, as the jsonrpc service is defined in docker-compose.yml.

A separate issue was not created since this is a small documentation fix.

Testing done

Verified the jsonrpc service is defined in docker-compose.yml and confirmed the corrected command follows the expected Docker Compose syntax.

[github-actions]

This PR targeted main, which is only the default/static branch.

I retargeted it to v0.123-dev, the active development branch. Pushes to v0.123-dev automatically fast-forward main.

[coderabbitai]

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