Update transformers dependency to exact version 4.55.2 in pyproject.t… (#1471)

* Update transformers dependency to exact version 4.55.2 in pyproject.toml and uv.lock to prevent import failures in Cosmos Embed. Downgrade tokenizers version to 0.21.4 for compatibility.

Signed-off-by: Abhinav Garg <abhinavg@stanford.edu>

* Update transformers dependency in pyproject.toml and uv.lock to allow versions up to 4.55.2, ensuring compatibility with Cosmos Embed imports.

Signed-off-by: Abhinav Garg <abhinavg@stanford.edu>

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Signed-off-by: Abhinav Garg <abhinavg@stanford.edu>
Co-authored-by: Ayush Dattagupta <ayushdg95@gmail.com>

Author: abhinavg4

pyproject.toml

@@ -202,7 +202,7 @@ override-dependencies = [
     "numpy>=2.0.0,<=2.2.0", # Override nemo-toolkits constraint of <2.0.0, upperbounds for Numba compatibility
     "protobuf>=5.29.5",  # Override nemo-toolkits constraint of ~=5.29.5
     "setuptools>=80.10.1", # Override setuptools range in other dependencies to address CVE GHSA-58pv-8j8x-9vj2
-    "transformers>=4.55.2",
+    "transformers<=4.55.2", # Else Cosmos Embed imports fail
 ]