Remove deleted k8s versions (#361)

Author: vishwanaths

k8s_version.json

@@ -1,6 +1,5 @@
 {
   "k3s": [
-    "1.26.4",
     "1.26.14",
     "1.27.2",
     "1.27.9",
@@ -31,11 +30,6 @@
     "1.32.1"
   ],
   "kubeadm": [
-    "1.26.4",
-    "1.26.8",
-    "1.26.10",
-    "1.26.12",
-    "1.26.15",
     "1.27.2",
     "1.27.5",
     "1.27.7",
@@ -69,12 +63,6 @@
     "1.31.6"
   ],
   "rke2": [
-    "1.26.4",
-    "1.26.8",
-    "1.26.10",
-    "1.26.12",
-    "1.26.14",
-    "1.26.15",
     "1.27.2",
     "1.27.5",
     "1.27.7",
@@ -115,9 +103,6 @@
     "1.32.1"
   ],
   "kubeadm-fips": [
-    "1.26.4",
-    "1.26.12",
-    "1.26.15",
     "1.27.2",
     "1.27.9",
     "1.27.14",