Update larastan.yml to use Larastan Org (#1483)

Starting with Larastan 2.7.0, the Larastan repository will now be managed under the Larastan organization.

Author: arnebr

data/tools/larastan.yml

@@ -7,8 +7,8 @@ tags:
 license: MIT License
 types:
   - cli
-source: 'https://github.com/nunomaduro/larastan'
-homepage: 'https://github.com/nunomaduro/larastan'
+source: 'https://github.com/larastan/larastan'
+homepage: 'https://github.com/larastan/larastan'
 description:  >-
   Adds static analysis to Laravel improving developer productivity and code quality.
   It is a wrapper around PHPStan.