Merge pull request #156 from rancher/gha-kubectl/update-release_v3.x-2025-08-17-01-36-19

[release/v3.x] Automated `kubectl` updates: `v1.31.12`

Author: mallardduck

kubectl-versions.txt

@@ -1,4 +1,4 @@
 v1.28.15
 v1.29.15
 v1.30.14
-v1.31.11
+v1.31.12