Update dependabot.yaml

Signed-off-by: Ryan Baxter <ryan.baxter@broadcom.com>

Author: ryanjbaxter

.github/dependabot.yaml

@@ -10,6 +10,9 @@ updates:
     target-branch: "main"
     schedule:
       interval: "weekly"
+    exclude-paths:
+      - ".github/workflows/release-train-test.yml"
+      - ".github/workflows/release-train-build.yml"      
   - package-ecosystem: maven
     directory: /
     schedule: