ci(dependabot): include 'application/' directory

Certain dependencies were not bumped by dependabot that were the most
needed so add a different entry to `.github/dependabot.yml` and include
the 'application/' subdirectory as well.

Signed-off-by: Chris Sdogkos <work@chris-sdogkos.com>

Author: christolis

.github/dependabot.yml

@@ -8,3 +8,8 @@ updates:
       - dependency-name: "*"
         update-types: ["version-update:semver-patch"]
     open-pull-requests-limit: 10
+  - package-ecosystem: "gradle"
+    directory: "/application"
+    schedule:
+      interval: "daily"
+    open-pull-requests-limit: 5