Bump dubbo from 2.5.7 to 2.6.12

Bumps [dubbo](https://github.com/apache/incubator-dubbo) from 2.5.7 to 2.6.12.
- [Release notes](https://github.com/apache/incubator-dubbo/releases)
- [Changelog](https://github.com/apache/dubbo/blob/3.0/CHANGES.md)
- [Commits](https://github.com/apache/incubator-dubbo/compare/dubbo-2.5.7...dubbo-2.6.12)

---
updated-dependencies:
- dependency-name: com.alibaba:dubbo
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/pom.xml b/pom.xml
index 0f711e6..c7fcc74 100644
--- a/pom.xml
+++ b/pom.xml
@@ -50,7 +50,7 @@
 		<dependency>
 			<groupId>com.alibaba</groupId>
 			<artifactId>dubbo</artifactId>
-			<version>2.5.7</version>
+			<version>2.6.12</version>
 		</dependency>
 		<dependency>
 			<groupId>io.netty</groupId>