Promote @jbandoro to committer (astronomer#744)

[Justin Bandoro](https://www.linkedin.com/in/justin-bandoro-592b14a7/)
(@jbandoro) is a Data Engineer at Kevala Inc. He's based in San
Francisco (USA) and has been an early adopter of Cosmos, using it
regularly at his company.

Not only has he been using Cosmos since the early stages, but he has
consistently improved Cosmos since January 2023:
![Screenshot 2023-12-04 at 16 28
29](https://github.com/astronomer/astronomer-cosmos/assets/272048/43197938-d1ab-431f-b101-b6026e5cd3ab)

Some of his contributions include new features, code quality,
documentation and overall improvements. Some examples:
* Speed up integration tests in 67% astronomer#732 
* Prevent override of dbt profile fields astronomer#702
* Add support for env vars in `RenderConfig` in astronomer#690 
* Use symbolic links to run local tasks, avoiding to copy potentially
huge dbt project folders in astronomer#660
* Improve documentation in astronomer#638
* Automated and improved the code complexity checks in astronomer#629
* Added `DbtDocsGCSOperator` in astronomer#616 
* Added support for Python 3.7 in astronomer#88 and astronomer#214

Additionally, he has been interacting with users in the #airflow-dbt
Slack channel in a very collaborative and supportive way.

We want to promote him as a Cosmos committer and maintainer for all
these, recognising his constant efforts and achievements towards our
community. Thank you very much, @jbandoro !

docs/contributors.rst

@@ -11,6 +11,7 @@ Committers
 * Chris Hronek (`@chrishronek <https://github.com/chrishronek>`_)
 * Harel Shein (`@harels <https://github.com/harels>`_)
 * Julian LaNeve (`@jlaneve <https://github.com/jlaneve>`_)
+* Justin Bandoro (`@jbandoro <https://github.com/jbandoro>`_)
 * Tatiana Al-Chueyr (`@tatiana <https://github.com/tatiana>`_)