Add future import for Py < 3.10 (#35666)

* Add future import for Py < 3.10

* make fixup

* Same issue in convert_olmo2_weights_to_hf.py

src/transformers/generation/streamers.py

@@ -13,6 +13,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+from __future__ import annotations
+
 import asyncio
 from queue import Queue
 from typing import TYPE_CHECKING, Optional

src/transformers/models/olmo2/convert_olmo2_weights_to_hf.py

@@ -11,6 +11,8 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+from __future__ import annotations
+
 import argparse
 import gc
 import json