Adds cloudscraper dependency for Cloudflare bypass

[YisusChrist]

Closes #71

📑 Description

• Introduces the cloudscraper package to facilitate bypassing Cloudflare's anti-bot page, enhancing web scraping capabilities.

• Replaces the standard requests session in the downloader with a cloudscraper instance, improving the handling of Cloudflare-protected resources.

✅ Checks

• My pull request adheres to the code style of this project
• My code requires changes to the documentation
• I have updated the documentation as required
• All the tests have passed

ℹ Additional Information

[Copilot]

Pull Request Overview

This PR integrates the cloudscraper package to bypass Cloudflare's anti-bot protection when scraping web content. The change replaces the standard requests.Session with a CloudScraper instance and simplifies the HTTP headers configuration.

• Adds cloudscraper dependency to handle Cloudflare-protected resources
• Replaces requests.Session with cloudscraper.create_scraper() in the downloader
• Removes extensive hardcoded headers that are now handled by cloudscraper

Reviewed Changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 2 comments.

File	Description
pyproject.toml	Adds cloudscraper dependency version ^1.2.71
spankbang_dl/downloader.py	Integrates cloudscraper and removes hardcoded headers