Fix initial version 1.29.0

if we just set 1.9.0 then renovate is not picking up 1.9.0+k3s1 and just wait until 1.9.1+k3s1 gets release. And the workflows fail in the meantime

vendir.yml

@@ -10,7 +10,7 @@ directories:
   - path: k3s-io/k3s
     githubRelease:
       slug: k3s-io/k3s
-      tag: v1.29.0
+      tag: v1.29.0+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.