Bump transformers and stop at <= 4.44.0

* Use >= 4.38.0 because that is the sentence-transformers min anyway.
* Add <= 4.44.0 because 4.44.0 breaks our tests with errors like this:
  > `RuntimeError: The expanded size of the tensor (22) must match the existing size (30) at non-singleton dimension 2.  Target sizes: [4, 22, 22].  Tensor sizes: [4, 1, 30]`

Signed-off-by: Mark Sturdevant <mark.sturdevant@ibm.com>

pyproject.toml

@@ -31,7 +31,7 @@ dependencies = [
     "tokenizers>=0.13.3",
     "torch>=2.3.1,<2.4.0",
     "tqdm>=4.65.0",
-    "transformers>=4.32.0",
+    "transformers>=4.38.0,<4.44.0",
     "peft==0.6.0",
 ]