avro to dependabot configs (#818)

Author: vladislav-sidorovich

.github/dependabot.yml

@@ -17,4 +17,7 @@ updates:
     - dependency-name: "org.springframework:"
       # Spring Framework 5.3.x is the latest with JDK 8 support
       # https://github.com/spring-projects/spring-framework/wiki/Spring-Framework-Versions#jdk-version-range
-      versions: [ ">5.3.x" ]
+      versions: [ ">5.3.x" ]
+    - dependency-name: "org.apache.avro:avro"
+      # Avro 1.12.0 was build with Java 11
+      versions: [">=1.12.0"]