MAINTAINERS: add @adrienthebo to collaborators (tldr-pages#8362)

Author: kbdharun

MAINTAINERS.md

@@ -56,6 +56,8 @@ If you are an owner of the organization, you can see an automated list
   [19 July 2022](https://github.com/tldr-pages/tldr/issues/8224) — present
 - **K.B.Dharun Krishna ([@kbdharun](https://github.com/kbdharun))**:
   [06 August 2022](https://github.com/tldr-pages/tldr/issues/8309) — present
+- **Adrien Thebo ([@adrienthebo](https://github.com/adrienthebo))**:
+  [17 August 2022](https://github.com/tldr-pages/tldr/issues/8321) — present
 - Owen Voke ([@owenvoke](https://github.com/owenvoke))
   [11 January 2018](https://github.com/tldr-pages/tldr/issues/1885) — [26 August 2018](https://github.com/tldr-pages/tldr/issues/2258)
 - Marco Bonelli ([@mebeim](https://github.com/mebeim)):