Update dubbo due to security issue

This should properly fix CVE-2023-23638
diff --git a/pom.xml b/pom.xml
index 51c1233..ebb7c64 100644
--- a/pom.xml
+++ b/pom.xml
@@ -14,7 +14,7 @@
         <java.target.version>1.8</java.target.version>
 
         <sentinel.version>1.6.0</sentinel.version>
-        <apache.dubbo.version>2.7.21</apache.dubbo.version>
+        <apache.dubbo.version>2.7.22</apache.dubbo.version>
 
         <junit.version>4.12</junit.version>
         <mockito.version>2.21.0</mockito.version>