dependabot: disable webpack upgrades

We are currently using @vue/cli-service which pulls in an older version of
webpack.  That is not compatible with versions past what we are currently
using.  In order to upgrade webpack further, we will need to drop the usage
of @vue/cli-service; the recommended path forward is to migrate to vite.

Signed-off-by: Mark Yen <mark.yen@suse.com>

Author: mook-as

.github/dependabot.yml

@@ -30,6 +30,12 @@ updates:
     # ignore until we arrive a solution that uses it.
     dependency-name: "@rancher/shell"
     versions: [">0.1"]
+  - # We are currently using @vue/cli-service which depends on an older version
+    # of webpack.  Upgrading webpack past what we currently have causes
+    # conflicts between the different versions of webpack.  Disable further
+    # updates of webpack until we can migrate off @vue/cli-service (which is
+    # unlikely to be fixed as it is in maintenance mode).
+    dependency-name: "webpack"
 
 # Maintain dependencies for Golang
 - package-ecosystem: "gomod"