Remove invalid Docker Dependabot update

Author: DenizAltunkapan

.github/dependabot.yml

@@ -1,11 +1,5 @@
 version: 2
 updates:
-  - package-ecosystem: "docker"
-    directory: "/"
-    schedule:
-      interval: "weekly"
-    open-pull-requests-limit: 5
-
   - package-ecosystem: "github-actions"
     directory: "/.github/workflows/"
     schedule:
@@ -22,4 +16,4 @@ updates:
 #    directory: "/frontend"
 #    schedule:
 #      interval: "daily"
-#    open-pull-requests-limit: 10
+#    open-pull-requests-limit: 10