chore: Update CODEOWNERS (#4115)

# Summary

* removes joshgl
* adds the tool-maintainers and slsa-tool-reviewers teams

see https://github.com/orgs/slsa-framework/teams?query=
## Testing Process

...

## Checklist

- [x] Review the contributing
[guidelines](https://github.com/slsa-framework/slsa-github-generator/blob/main/CONTRIBUTING.md)
- [ ] Add a reference to related issues in the PR description.
- [ ] Update documentation if applicable.
- [ ] Add unit tests if applicable.
- [ ] Add changes to the
[CHANGELOG](https://github.com/slsa-framework/slsa-github-generator/blob/main/CHANGELOG.md)
if applicable.

Signed-off-by: Ramon Petgrave <[email protected]>

Author: ramonpetgrave64

CODEOWNERS

@@ -1,2 +1,2 @@
-* @laurentsimon @joshuagl @kpk47 @ramonpetgrave64
-SECURITY.md @laurentsimon @joshuagl @kpk47 @ramonpetgrave64
+* @slsa-framework/tool-maintainers @slsa-framework/slsa-tool-reviewers
+SECURITY.md @slsa-framework/tool-maintainers @slsa-framework/slsa-tool-reviewers