Bump stable to v1.34.4+rke2r1 (rancher#9725)

Author: rafaelbreno

channels.yaml

@@ -1,6 +1,6 @@
 channels:
 - name: stable
-  latest: v1.34.3+rke2r3
+  latest: v1.34.4+rke2r1
 - name: latest
   latestRegexp: .*
   excludeRegexp: (^[^+]+-|v1\.25\.5\+rke2r1|v1\.26\.0\+rke2r1)