Update dependabot.yml

Author: binon

.github/dependabot.yml

@@ -17,6 +17,8 @@ updates:
       - dependency-name: "LearningHub.Nhs.Models*"
       - dependency-name: "LearningHub.Nhs.Caching*"
       - dependency-name: "elfhHub.Nhs.Models*"   
+      - dependency-name: "GDS.MultiPageFormData*"   
+      - dependency-name: "UK.NHS.CookieBanner*"   
       - dependency-name: "linqtotwitter*"         
       # Ignore some updates to the package
       - dependency-name: "Microsoft.VisualStudio.Web.CodeGeneration.Design"