Apply isort and black reformatting

Signed-off-by: ko3n1g <ko3n1g@users.noreply.github.com>

Author: ko3n1g

tests/lightning/pytorch/strategies/test_megatron_strategy.py

@@ -12,9 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import pytest
 from unittest.mock import MagicMock, patch
 
+import pytest
+
 from nemo.lightning.pytorch.strategies import MegatronStrategy