Ignore jetty >= 10 dependency upgrades from dependabot in core

jetty >= 10 requires JDK 11


Change-Id: I2378a009891084cf2dd6c920922b91a236a8128d
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index d51261c..5b357ff 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -9,10 +9,23 @@
     directory: "/core" # Location of package manifests
     schedule:
       interval: "daily"
+    ignore:
+      # Jetty >= 10 requires JDK 11
+      - dependency-name: "org.eclipse.jetty:jetty-server"
+        versions:
+          - ">= 10.0.0"
+      - dependency-name: "org.eclipse.jetty:jetty-servlet"
+        versions:
+          - ">= 10.0.0"
+      - dependency-name: "org.eclipse.jetty:jetty-webapp"
+        versions:
+          - ">= 10.0.0"
+
   - package-ecosystem: "maven" # See documentation for possible values
     directory: "/lite" # Location of package manifests
     schedule:
       interval: "daily"
+
   - package-ecosystem: "maven" # See documentation for possible values
     directory: "/full" # Location of package manifests
     schedule: