Update deprecated type hinting in models (#18132)

Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>

vllm/model_executor/models/paligemma.py

@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: Apache-2.0
 from collections.abc import Iterable, Mapping, Sequence
-from typing import Literal, Optional, Set, Tuple, TypedDict, Union
+from typing import Literal, Optional, TypedDict, Union
 
 import torch
 from torch import nn
@@ -391,7 +391,7 @@ class PaliGemmaForConditionalGeneration(nn.Module, SupportsMultiModal,
         return self.language_model.compute_logits(hidden_states,
                                                   sampling_metadata)
 
-    def load_weights(self, weights: Iterable[Tuple[str,
-                                                   torch.Tensor]]) -> Set[str]:
+    def load_weights(self, weights: Iterable[tuple[str,
+                                                   torch.Tensor]]) -> set[str]:
         loader = AutoWeightsLoader(self)
         return loader.load_weights(weights)