Add Dependabot entries for 5.0.x

.github/dependabot.yml

@@ -38,3 +38,31 @@ updates:
     directory: /docs
     schedule:
       interval: weekly
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    target-branch: "5.0.x"
+    exclude-paths:
+      - ".github/workflows/release-train-test.yml"
+      - ".github/workflows/release-train-build.yml"
+    schedule:
+      interval: "weekly"
+  - package-ecosystem: maven
+    directory: /
+    schedule:
+      interval: daily
+    target-branch: 5.0.x
+    ignore:
+      # IDE specific dependency
+      - dependency-name: "org.eclipse.m2e:lifecycle-mapping"
+      # JRuby updates are causing docs generation to fail
+      - dependency-name: "org.jruby:jruby-complete"
+      # only upgrade by minor or patch
+      - dependency-name: "*"
+        update-types:
+          - version-update:semver-major
+          - version-update:semver-minor
+  - package-ecosystem: npm
+    target-branch: 5.0.x
+    directory: /docs
+    schedule:
+      interval: weekly