dependabot: remove gomod

it is not really required, we update Go dependencies regularly

Signed-off-by: Nicola Murino <nicola.murino@gmail.com>

.github/dependabot.yml

@@ -1,11 +1,11 @@
 version: 2
 
 updates:
-  - package-ecosystem: "gomod"
-    directory: "/"
-    schedule:
-      interval: "weekly"
-    open-pull-requests-limit: 2
+  #- package-ecosystem: "gomod"
+  #  directory: "/"
+  #  schedule:
+  #    interval: "weekly"
+  #  open-pull-requests-limit: 2
 
   - package-ecosystem: "docker"
     directory: "/"