v2.6.8

## What's Changed

### 🎉 New Features
* Added hudsonrock source by @dogancanbakir in https://github.com/projectdiscovery/subfinder/pull/1481

### 🐞 Bug Fixes
* Fixed negative statistics for sitedossier source by @dogancanbakir in https://github.com/projectdiscovery/subfinder/pull/1432
* Fixed GitHub source' performance issue by @dogancanbakir in https://github.com/projectdiscovery/subfinder/pull/1421
* Fixed the issue with source initialization to prevent the program from exiting when encountering invalid sources during initialization by @dogancanbakir in https://github.com/projectdiscovery/subfinder/pull/1468


### Other Changes
* Removed the columbus source due to consistently encountering 502 errors by @dogancanbakir in https://github.com/projectdiscovery/subfinder/pull/1430
* Make failing sources non-default and exclude from the tests  by @dogancanbakir in https://github.com/projectdiscovery/subfinder/pull/1475
* Removed subdomaincenter as its output quality was unsatisfactory by @dogancanbakir in https://github.com/projectdiscovery/subfinder/pull/1500
* Updated dnsdumpster source to use its new API by @dogancanbakir in https://github.com/projectdiscovery/subfinder/pull/1484
* Improved the usability of the Subfinder SDK by enabling the return of the source map by @mielverkerken in https://github.com/projectdiscovery/subfinder/pull/1466


## New Contributors
* @mielverkerken made their first contribution in https://github.com/projectdiscovery/subfinder/pull/1466

**Full Changelog**: https://github.com/projectdiscovery/subfinder/compare/v2.6.7...v2.6.8