[Elastic EP] Reuse CUDA graphs across reconfiguration (#54985)

requirements/kv_connectors.txt

@@ -2,7 +2,7 @@ lmcache >= 0.3.9
 # CuPy 14.1.0 imports pytest from cupy.testing._random, which breaks runtime
 # images. 14.1.1 fixes the root cause, so only 14.1.0 is excluded.
 cupy-cuda13x != 14.1.0
-nixl == 1.3.2
+nixl == 1.4.1
 # CUDA 12 build. On the CUDA 13 image install-kv-connectors.sh swaps this for
 # the mooncake-transfer-engine-cuda13 variant of the same version.
 mooncake-transfer-engine >= 0.3.12