[CI] Update path for libcxx-runners runner binary

The container has been updated to use the same path as the next runner set,
but the path had not been upgraded inside the helm release, causing pods to
fail to start.

Author: boomanaiden154

premerge/premerge_resources/main.tf

@@ -238,7 +238,7 @@ resource "helm_release" "github_actions_runner_set_libcxx" {
   chart      = "gha-runner-scale-set"
 
   values = [
-    "${templatefile("libcxx_runners_values.yaml", { runner_group_name : var.runner_group_name, runner_image : var.libcxx_runner_image, command : "/home/runner/run.sh" })}"
+    "${templatefile("libcxx_runners_values.yaml", { runner_group_name : var.runner_group_name, runner_image : var.libcxx_runner_image, command : "/home/gha/actions-runner/run.sh" })}"
   ]
 
   depends_on = [