Update dependabot configuration

Exclude JUnit 6 (requires Java 17), add v4.2.x branch for GitHub actions
and Maven.

Author: acogoluegnes

.github/dependabot.yaml

@@ -6,6 +6,11 @@ updates:
     schedule:
       interval: "daily"
     target-branch: "main"
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"
+    target-branch: "v4.2.x"
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
@@ -39,6 +44,32 @@ updates:
     ignore:
       - dependency-name: "ch.qos.logback:logback-classic"
         versions: [ "[1.3,)" ]
+      - dependency-name: "org.junit:*"
+        versions: [ "[6.0,)" ]
+  - package-ecosystem: "maven"
+    directories:
+      - "/deps/rabbit/test/amqp_jms_SUITE_data"
+      - "/deps/rabbitmq_mqtt/test/java_SUITE_data"
+      - "/deps/rabbitmq_stream/test/rabbit_stream_SUITE_data"
+      - "/deps/rabbitmq_stream_management/test/http_SUITE_data"
+      - "/deps/rabbitmq_auth_backend_http/examples/rabbitmq_auth_backend_spring_boot"
+      - "/deps/rabbitmq_auth_backend_http/examples/rabbitmq_auth_backend_spring_boot_kotlin"
+    schedule:
+      interval: "weekly"
+      day: "saturday"
+    groups:
+      dev-deps:
+        dependency-type: "development"
+      prod-deps:
+        dependency-type: "production"
+    commit-message:
+      prefix: "[skip ci] "
+    target-branch: "v4.2.x"
+    ignore:
+      - dependency-name: "ch.qos.logback:logback-classic"
+        versions: [ "[1.3,)" ]
+      - dependency-name: "org.junit:*"
+        versions: [ "[6.0,)" ]
   - package-ecosystem: "maven"
     directories:
       - "/deps/rabbit/test/amqp_jms_SUITE_data"
@@ -61,6 +92,8 @@ updates:
     ignore:
       - dependency-name: "ch.qos.logback:logback-classic"
         versions: [ "[1.3,)" ]
+      - dependency-name: "org.junit:*"
+        versions: [ "[6.0,)" ]
   - package-ecosystem: "maven"
     directories:
       - "/deps/rabbit/test/amqp_system_SUITE_data/java-tests"
@@ -83,3 +116,5 @@ updates:
     ignore:
       - dependency-name: "ch.qos.logback:logback-classic"
         versions: [ "[1.3,)" ]
+      - dependency-name: "org.junit:*"
+        versions: [ "[6.0,)" ]