chore: reassign ml-sys CODEOWNERship to model-dev (#9000)

ml-sys is no more, but model-dev ownership is similar enough that a wholesale swap is a good enough place to start.

.github/CODEOWNERS

@@ -22,18 +22,18 @@
 /docs/index.rst     @determined-ai/docs
 /docs/**/index.rst  @determined-ai/docs
 
-# Harness is mapped to ml-sys by default, except for `cli`, `deploy`,
+# Harness is mapped to model-dev by default, except for `cli`, `deploy`,
 # and auto-generated bindings and version files.
-/harness  @determined-ai/ml-sys
+/harness  @determined-ai/model-dev
 /harness/determined/common/api/bindings.py
 /harness/determined/__version__.py
 
-/schemas                          @determined-ai/ml-sys
-/bindings/generate_bindings_py.py @determined-ai/ml-sys
-/e2e_tests/tests/*.py             @determined-ai/ml-sys
-/e2e_tests/tests/requirements.txt @determined-ai/ml-sys
-/e2e_tests/tests/experiment       @determined-ai/ml-sys
-/e2e_tests/tests/nightly          @determined-ai/ml-sys
+/schemas                          @determined-ai/model-dev
+/bindings/generate_bindings_py.py @determined-ai/model-dev
+/e2e_tests/tests/*.py             @determined-ai/model-dev
+/e2e_tests/tests/requirements.txt @determined-ai/model-dev
+/e2e_tests/tests/experiment       @determined-ai/model-dev
+/e2e_tests/tests/nightly          @determined-ai/model-dev
 
 # Backend owns some e2e tests.
 /e2e_tests/tests/cluster  @determined-ai/backend