[CI] enable dependabot for GHA workflows

[XuehaiPan]

Summary by CodeRabbit

• Chores
  • Standardized editor formatting across the repository (UTF-8, LF, final newline, trimmed trailing whitespace; language-specific indentation rules) to improve consistency across editors.
  • Enabled automated weekly updates for GitHub Actions with commit messages prefixed “[CI]” (scheduled Mondays at 12:00 Asia/Shanghai) to keep CI tooling current.
  • Removed a redundant CI workflow to streamline automation.

No product, API, or UI changes.

[github-actions]

👋 Hi! Thank you for contributing to the TileLang project.

Please remember to run bash format.sh in the root directory of the project to ensure your changes are properly linted and formatted. This will help ensure your contribution passes the format check.

We appreciate you taking this step! Our team will review your contribution, and we look forward to your awesome work!

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[coderabbitai]

Walkthrough

Adds repository-wide editor settings via .editorconfig, introduces Dependabot configuration for weekly GitHub Actions updates, and removes a previously defined GitHub Actions workflow for “Dependent Bot Action.”

Changes

Cohort / File(s)	Summary
Editor configuration \.editorconfig	Added root editor configuration: UTF-8, LF, spaces (indent_size 4), trim trailing whitespace, insert final newline; per-language overrides (Python/C/C++ 4; YAML/clang-* 2; Makefile tabs; shell 4; batch 4 + CRLF; Markdown/ReST indent 2, soft wrap).
Dependabot configuration .github/dependabot.yml	Added Dependabot setup for GitHub Actions: weekly schedule (Monday 12:00, Asia/Shanghai), scope at root, commit message prefix "[CI]".
Workflow removal .github/workflows/dependabot.yml	Deleted workflow that ran on PRs to main and manual dispatch, set up Python 3.x, and installed requirements.txt.

Sequence Diagram(s)

sequenceDiagram
    autonumber
    actor Dev as Developer
    participant GH as GitHub
    participant DB as Dependabot

    Dev->>GH: Add .editorconfig and .github/dependabot.yml<br/>Remove .github/workflows/dependabot.yml
    Note over GH: Workflow "Dependent Bot Action" no longer present

    rect rgb(230,245,255)
    Note over DB,GH: Weekly schedule (Mon 12:00 Asia/Shanghai)
    DB-->>GH: Check GitHub Actions dependencies at repo root
    DB->>GH: Open PR with commit message prefix "[CI]"
    end

    GH-->>Dev: Notify about new dependency update PR

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Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

Bunny taps keys with tidy delight,
Tabs for Makefiles, two for YAML just right.
Dependabot hops, Mondays at noon,
“[CI]” blooms in a PR cocoon.
Old workflow burrowed away from sight—
Fresh configs gleam in editor light. 🐇✨

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title Check	✅ Passed	The title concisely and accurately describes the primary change, which is enabling Dependabot for GitHub Actions workflows, aligning with the added dependabot configuration and removal of the old workflow file. It is clear, specific, and avoids unnecessary details. The addition of .editorconfig is a minor formatting update and does not need to be mentioned in the title.
Docstring Coverage	✅ Passed	No functions found in the changes. Docstring coverage check skipped.

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 7fb0677 and 19c5884.

📒 Files selected for processing (3)

• .editorconfig (1 hunks)
• .github/dependabot.yml (1 hunks)
• .github/workflows/dependabot.yml (0 hunks)

💤 Files with no reviewable changes (1)

• .github/workflows/dependabot.yml

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[LeiWang1999]

LGTM, Merged:)