Add checkpoint BC tests for 0.27.0 and 0.28.0 (#3735)

tests/trainer/test_fsdp_checkpoint.py

@@ -515,6 +515,8 @@ def test_fsdp_mixed_with_sync(
         '0.24.0',
         '0.25.0',
         '0.26.0',
+        '0.27.0',
+        '0.28.0',
     ],
 )
 @pytest.mark.filterwarnings(r'ignore:.*metrics are not saved with sharded state dict.*:UserWarning')
@@ -534,9 +536,12 @@ def test_fsdp_load_old_checkpoint(
     if composer_version == '0.18.1' and state_dict_type == 'full' and precision == 'amp_bf16' and sharding_strategy == 'FULL_SHARD':
         pytest.skip('TODO: This checkpoint is missing')
 
-    if (composer_version in ['0.22.0', '0.23.0'] and version.parse(torch.__version__) < version.parse('2.3.0')) or (
-        composer_version in ['0.24.0', '0.25.0'] and version.parse(torch.__version__) < version.parse('2.4.0')
-    ) or (composer_version in '0.26.0' and version.parse(torch.__version__) < version.parse('2.5.0')):
+    if (composer_version in ['0.22.0', '0.23.0'] and version.parse(torch.__version__) < version.parse('2.3.0')
+       ) or (composer_version in ['0.24.0', '0.25.0'] and
+             version.parse(torch.__version__) < version.parse('2.4.0')) or (
+                 composer_version in ['0.26.0', '0.27.0', '0.28.0'] and
+                 version.parse(torch.__version__) < version.parse('2.5.0')
+             ):
         pytest.skip('Current torch version is older than torch version that checkpoint was written with.')
 
     if composer_version in ['0.13.5', '0.14.0', '0.14.1', '0.15.1']: