Enable Dependabot for automated dependency updates

[KushDutta23]

Adds Dependabot configuration to enable automated dependency updates.

• Enabled pip (Python), npm (JavaScript), and GitHub Actions updates
• Weekly schedule to balance update frequency and noise

This is a configuration-only change and does not affect existing functionality.

Summary by Sourcery

Build:

• Introduce Dependabot configuration for weekly pip, npm, and GitHub Actions dependency update checks and pull requests.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adds a Dependabot configuration file to enable weekly automated dependency update PRs for pip, npm, and GitHub Actions with a limit on concurrent update PRs.

Sequence diagram for weekly Dependabot dependency update process

sequenceDiagram
  participant Scheduler as Weekly_scheduler
  participant Dependabot as GitHub_Dependabot
  participant Repo as Repository
  participant Maintainer as Repository_maintainer

  Scheduler->>Dependabot: Trigger_weekly_run
  Dependabot->>Repo: Read_dependabot_yml_config
  Dependabot->>Repo: Scan_pip_dependencies
  Dependabot->>Repo: Scan_npm_dependencies
  Dependabot->>Repo: Scan_github_actions_versions

  Dependabot->>Dependabot: Calculate_required_updates
  Dependabot->>Dependabot: Enforce_open_PR_limit_max_5

  loop For_each_allowed_update
    Dependabot->>Repo: Create_dependency_update_PR
    Repo-->>Maintainer: Notify_about_new_PR
  end

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File-Level Changes

Change	Details	Files
Introduce Dependabot configuration for automated dependency updates across ecosystems.	Add .github/dependabot.yml with version 2 configuration syntax Configure weekly update schedule for pip dependencies at repository root with a cap on open Dependabot PRs Configure weekly update schedule for npm dependencies at repository root with a cap on open Dependabot PRs Configure weekly update schedule for GitHub Actions workflows at repository root	.github/dependabot.yml

Possibly linked issues

• #Configure Dependabot version updates for the visdom repository: PR adds .github/dependabot.yml enabling weekly pip, npm, and GitHub Actions updates as requested in the issue.

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[sourcery-ai]

Hey - I've left some high level feedback:

• Consider specifying a time and day for the weekly schedules to control when Dependabot PRs arrive and avoid them landing during peak working hours.
• You may want to add ignore or groups settings (especially for npm and pip) to avoid a large number of small PRs for minor/patch updates and to bundle related dependency bumps together.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider specifying a `time` and `day` for the weekly schedules to control when Dependabot PRs arrive and avoid them landing during peak working hours.
- You may want to add `ignore` or `groups` settings (especially for npm and pip) to avoid a large number of small PRs for minor/patch updates and to bundle related dependency bumps together.

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[KushDutta23]

Thanks for the suggestions!

I've updated the Dependabot configuration to:

• Specify a fixed day and time for weekly updates to avoid peak hours
• Group dependency updates for pip and npm to reduce PR noise

This should make updates more predictable and easier to review.
Let me know if you'd prefer a different schedule or grouping strategy.