[SCB-2489] optimize dependabot config (#2958)

diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index 6e2e686..4bf5889 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -22,10 +22,7 @@
     directory: "/"
     schedule:
       interval: "daily"
-  - package-ecosystem: "maven"
-    directory: "/dependencies/default"
-    schedule:
-      interval: "daily"
+    open-pull-requests-limit: 20
     ignore:
       - dependency-name: "jakarta.activation"
         versions:
diff --git a/dependencies/default/pom.xml b/dependencies/default/pom.xml
index 621c80d..97520c5 100644
--- a/dependencies/default/pom.xml
+++ b/dependencies/default/pom.xml
@@ -677,12 +677,6 @@
 
       <dependency>
         <groupId>org.mockito</groupId>
-        <artifactId>mockito-all</artifactId>
-        <version>${mockito.version}</version>
-        <scope>test</scope>
-      </dependency>
-      <dependency>
-        <groupId>org.mockito</groupId>
         <artifactId>mockito-core</artifactId>
         <version>${mockito.version}</version>
         <scope>test</scope>