Update emeritus contributors list (#961)

There have been people who had a major role in the creation and/or
development of Cosmos in previous phases, but for different
circumstances, they have not been able to continue contributing to it in
more recent times. This is not only from a code perspective, but also
from a community perspective:

<img width="410" alt="Screenshot 2024-05-14 at 11 38 12"
src="https://github.com/astronomer/astronomer-cosmos/assets/272048/c8312fcb-db7d-44bf-b18a-a5867dbbbb4e">
<img width="413" alt="Screenshot 2024-05-14 at 11 38 03"
src="https://github.com/astronomer/astronomer-cosmos/assets/272048/48e43f7d-9625-4139-a4b3-5c2b4b92662e">

With this change, we recognize their contributions. If, in the future,
they start to contribute again to the project, we'll move them to the
contributions section again, regaining committer superpowers.

More information in the contributors roles can be found at:
https://github.com/astronomer/astronomer-cosmos/blob/main/docs/contributors-roles.rst

docs/contributors.rst

@@ -8,9 +8,7 @@ Learn more about the project contributors roles in :ref:`contributors-roles`.
 Committers
 ----------------------
 
-* Chris Hronek (`@chrishronek <https://github.com/chrishronek>`_)
 * Daniel Reeves (`@dwreeves <https://github.com/dwreeves>`_)
-* 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>`_)
@@ -19,7 +17,7 @@ Committers
 Emeritus Committers
 -------------------------------
 
-(none at the moment)
+* Chris Hronek (`@chrishronek <https://github.com/chrishronek>`_)
 
 Contributors
 ------------