fix(github-release): update dependency external-snapshotter-source to…

… v6.3.4 (#3113)

| datasource  | package                             | from   | to     |
| ----------- | ----------------------------------- | ------ | ------ |
| github-tags | kubernetes-csi/external-snapshotter | v6.3.1 | v6.3.4 |

Co-authored-by: henry-pa-bot[bot] <98217877+henry-pa-bot[bot]@users.noreply.github.com>

cluster/crds/external-snapshotter/crds.yaml

@@ -9,7 +9,7 @@ spec:
   url: https://github.com/kubernetes-csi/external-snapshotter.git
   ref:
     # renovate: datasource=github-releases depName=kubernetes-csi/external-snapshotter
-    tag: v6.3.1
+    tag: v6.3.4
   ignore: |
     # exclude all
     /*