ci: bump megatron-bridge to 8645cda

Signed-off-by: nemo-ci-bot <nemo-ci-bot@nvidia.com>

Author: nemo-ci-bot

3rdparty/Megatron-Bridge-workspace/Megatron-Bridge

@@ -27,7 +27,7 @@
 
 # Default dependencies from pyproject.toml
 CACHED_DEPENDENCIES = [
-    "transformers>=5.8.1,<5.9.0",
+    "transformers>=5.8,<=5.12.1",
     "mistral-common>=1.10.0",
     "peft>=0.18.1",
     "datasets>=2.20.0",

3rdparty/Megatron-Bridge-workspace/setup.py

@@ -575,7 +575,7 @@ name = "megatron-bridge"
 # Must stay in sync with 3rdparty/Megatron-Bridge-workspace/setup.py::CACHED_DEPENDENCIES.
 version = "0.0.0"
 requires-dist = [
-  "transformers>=5.8.1,<5.9.0",
+  "transformers>=5.8,<=5.12.1",
   "mistral-common>=1.10.0",
   "peft>=0.18.1",
   "datasets>=2.20.0",