Update dependabot.yml to exclude nxdt req (#143)

*Issue #, if available:*

*Description of changes:*


By submitting this pull request, I confirm that you can use, modify,
copy, and redistribute this contribution, under the terms of your
choice.

Author: ahsan-z-khan

.github/dependabot.yml

@@ -1,10 +1,13 @@
 version: 2
 updates:
-- package-ecosystem: "docker"
-  directory: "/"
-  schedule:
-    interval: "daily"
-- package-ecosystem: "github-actions"
-  directory: "/"
-  schedule:
-    interval: "daily"
+  - package-ecosystem: "docker"
+    directory: "/"
+    schedule:
+      interval: "daily"
+    ignore:
+      - dependency-name: "docker/common/nxdt_requirements.txt"
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"