tools: Update nightly version to 2.9.0 (#6883)

I don't know why this is here but this was failing in upstream pytorch
nightlies, see
https://github.com/pytorch/pytorch/actions/runs/15941894992/job/44971349112

Author: seemethere

tools/scripts/generate_binary_build_matrix.py

@@ -75,7 +75,7 @@
 XPU = "xpu"
 
 
-CURRENT_NIGHTLY_VERSION = "2.8.0"
+CURRENT_NIGHTLY_VERSION = "2.9.0"
 CURRENT_CANDIDATE_VERSION = "2.8.0"
 CURRENT_STABLE_VERSION = "2.7.1"
 CURRENT_VERSION = CURRENT_STABLE_VERSION