[Tooling] Setup Dependabot for Updates

[p3ris0n]

Reward: 200 Points (Stellar Wave 5)

Description
Automate Rust and NPM dependency updates.

Acceptance Criteria
Create .github/dependabot.yml covering both Cargo and npm ecosystems.

[artylobos]

/claim

Submitted PR #106 for Stellar Wave 5 issue #85:
#106

Scope: add .github/dependabot.yml covering Cargo at / and npm in /sdk, /cli, /react, and /indexer, with weekly grouped updates and PR limits to reduce noise.

Validation:

• git diff --check -- .github/dependabot.yml
• Ruby YAML parse/version check for .github/dependabot.yml
• Verified configured directories exist: /, /sdk, /cli, /react, /indexer

[N-i-xx]

@N-i-xx has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Dear maintainer
Please assign me this issue

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Congratulations, @N-i-xx! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

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[drips-wave]

This issue has been completed by @N-i-xx as part of the Stellar Wave Program's 5th Wave 🥳

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