ci(dependabot): schedule weekly updates

[WH-2099]

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Related Issue

Closes #147

Summary

• Changes both Dependabot update schedules from daily to weekly.
• Assigns generated Dependabot update PRs to @WH-2099.

Checklist

• This pull request links the issue it resolves or advances
• This pull request title follows Conventional Commits, and any breaking change is marked with !
• If CLA Assistant prompted me, I signed CLA.md in the pull request conversation

[QuantumGhost]

LGTM