fix: update dependabot to use conventional commit types

[Copilot]

Updates the dependabot configuration to use proper conventional commit types that align with the project's commit message standards.

Problem

The dependabot configuration was using deps as the commit message prefix for npm dependency updates, which is not a valid conventional commit type according to the project's specification.

Solution

Changed the npm dependencies commit message prefix from deps to build in .github/dependabot.yml. The build type is the appropriate conventional commit type for changes that affect the build system or external dependencies.

Changes

• npm dependencies: Changed prefix from deps → build
• GitHub Actions: Kept ci prefix (already correct)

Both prefixes now conform to the conventional commit types specification:

• build: Changes that affect the build system or external dependencies
• ci: Changes to CI configuration files and scripts

This ensures that dependabot-generated pull requests will have commit messages that pass the project's PR title validation workflow.

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[Copilot]

Pull Request Overview

This PR updates the dependabot configuration to use proper conventional commit types that align with the project's commit message standards. The change ensures dependabot-generated pull requests will have commit messages that pass the project's PR title validation workflow.

• Changed npm dependencies commit message prefix from deps to build
• Maintains ci prefix for GitHub Actions (already correct)

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