ci(dependbot): add maven repository

.github/dependabot.yml

@@ -4,12 +4,31 @@
 # https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
 
 version: 2
+registries:
+  maven-google:
+    type: maven-repository
+    url: https://maven.google.com
+    password: dummy
+    username: dummy
+  maven-central:
+    type: maven-repository
+    url: https://repo1.maven.org/maven2/
+    password: dummy
+    username: dummy
+  maven-jitpack:
+    type: maven-repository
+    url: https://jitpack.io
+    password: dummy
+    username: dummy
+
 updates:
   - package-ecosystem: gradle
     directory: "app"
     schedule:
       interval: "daily"
+    registries: "*"
   - package-ecosystem: gradle
     directory: "epublib"
     schedule:
       interval: "daily"
+    registries: "*"