Fix Team Tagging in CODEOWNERS

Summary:
The pytorch-dev-infra team taggin syntax in codeowners currently
doesn't work (see: pytorch#75221). Trying to
fix that in this PR.

Test Plan: TBD

Differential Revision: D35372228

Pull Request resolved: pytorch#75222
Approved by: https://github.com/seemethere

CODEOWNERS

@@ -47,9 +47,9 @@
 /.github/ @seemethere @janeyx99 @atalman
 
 # Custom Test Infrastructure
-/test/run_test.py @pytorch-dev-infra
+/test/run_test.py @pytorch/pytorch-dev-infra
 /torch/testing/_internal/common_device_type.py @mruberry
-/torch/testing/_internal/common_utils.py @pytorch-dev-infra
+/torch/testing/_internal/common_utils.py @pytorch/pytorch-dev-infra
 
 # Parametrizations
 /torch/nn/utils/parametriz*.py @lezcano