docs: remove outdated references to CODEOWNERS

As of b01ca00aed65 (CODEOWNERS: Switch to alternate mechanism,
2024-10-10) and #336261, this repository doesn't use the GitHub
CODEOWNERS file, but instead has its own similar mechanism. Remove and
update references to the CODEOWNERS file in various documentation files.

Changed files
+4 -4
maintainers
nixos
pkgs
development
haskell-modules
+1 -1
maintainers/README.md
···
For critical packages, this convention needs to be negotiated with the
maintainer. A critical package is one that causes mass-rebuild, or where an
-
author is listed in the [`CODEOWNERS`](../.github/CODEOWNERS) file.
+
author is listed in the [`OWNERS`](../ci/OWNERS) file.
In case of critical security updates, the [security team](https://nixos.org/community/teams/security) might override these
heuristics in order to get the fixes in as fast as possible.
+1 -1
nixos/README.md
···
Reviewing process:
- Ensure that the module maintainers are notified.
-
- [CODEOWNERS](https://help.github.com/articles/about-codeowners/) will make GitHub notify users based on the submitted changes, but it can happen that it misses some of the package maintainers.
+
- The continuous integration system will make GitHub notify users based on the submitted changes, but it can happen that it misses some of the package maintainers.
- Ensure that the module tests, if any, are succeeding.
- You may invoke OfBorg with `@ofborg test <module>` to build `nixosTests.<module>`
- Ensure that the introduced options are correct.
+1 -1
pkgs/README.md
···
- Ensure that the package versioning [fits the guidelines](#versioning).
- Ensure that the commit text [fits the guidelines](../CONTRIBUTING.md#commit-conventions).
- Ensure that the package maintainers are notified.
-
- [CODEOWNERS](https://help.github.com/articles/about-codeowners) will make GitHub notify users based on the submitted changes, but it can happen that it misses some of the package maintainers.
+
- The continuous integration system will make GitHub notify users based on the submitted changes, but it can happen that it misses some of the package maintainers.
- Ensure that the meta field information [fits the guidelines](#meta-attributes) and is correct:
- License can change with version updates, so it should be checked to match the upstream license.
- If the package has no maintainer, a maintainer must be set. This can be the update submitter or a community member that accepts to take maintainership of the package.
+1 -1
pkgs/development/haskell-modules/HACKING.md
···
and work the new member into the `haskell-updates` rotation.
1. Optionally, have the new member add themselves to the Haskell
-
section in [`CODEOWNERS`](../../../.github/CODEOWNERS). This
+
section in [`OWNERS`](../../../ci/CODEOWNERS). This
will cause them to get pinged on most Haskell-related PRs.