Upgrade the inspektor gadget to latest stable version. (Azure#525)

Co-authored-by: Tatsat Mishra <tatsat.mishra@microsoft.com>

Author: Tatsinnit

package.json

@@ -115,7 +115,7 @@
                 },
                 "azure.kubectlgadget.releaseTag": {
                     "type": "string",
-                    "default": "v0.19.0",
+                    "default": "v0.25.1",
                     "title": "Kubectl-gadget repository release tag",
                     "description": "Release tag for the stable kubectl-gadget tool."
                 },