Remove obsolete Dependabot configuration

[colonelpanic8]

What changed

Remove the obsolete .github/dependabot.yml configuration. The repository now uses Renovate for dependency updates, and Renovate already excludes the intentionally constrained numba and llvmlite packages.

Why

The scheduled Dependabot Updates job was failing while attempting to update llvmlite to 0.47.0, which cannot satisfy the project's llvmlite <0.46 and numba <0.63 constraints. Removing the stale Dependabot configuration prevents that conflicting updater from running.

Validation

• uv lock --check
• uv sync --frozen --group dev --no-install-project
• uv run --no-sync make lint
• uv run --no-sync make typecheck
• uv run --no-sync make test — 1301 passed

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