Bump dubbo from 2.5.3 to 2.6.12 in /dubbo-demo/dubbo-provider#37

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dependabot/maven/dubbo-demo/dubbo-provider/com.alibaba-dubbo-2.6.12Humsen/java-demos:dependabot/maven/dubbo-demo/dubbo-provider/com.alibaba-dubbo-2.6.12Copy head branch name to clipboard