k8s(1.26): initial setup

Bump vendir to a dummy 1.26 version, and wait for renovate bump proposal

vendir.yml

@@ -12,7 +12,7 @@ directories:
   - path: kubernetes/kubectl
     githubRelease:
       slug: kubernetes/kubernetes
-      tag: v1.24.17
+      tag: v1.26.0
       disableAutoChecksumValidation: true
       http:
         # The url parameter of http can interpolate the tag of the GitHub release using the {tag} token.
@@ -22,7 +22,7 @@ directories:
   - path: k3s-io/k3s
     githubRelease:
       slug: k3s-io/k3s
-      tag: v1.24.17+k3s1 
+      tag: v1.26.0+k3s1
       disableAutoChecksumValidation: true
       assetNames: # only download specific assets (optional; v0.12.0+). We use assetNames inside githubRelease instead of
       # includePaths at path level. Using includePaths downloads all assets and filter after.