SLING-8116 - ValueMap - implement default methods using OSGI Converter

* updated o.a.s.api due to the org.apache.sling.api.resource import
diff --git a/pom.xml b/pom.xml
index aa238d2..fc8db67 100644
--- a/pom.xml
+++ b/pom.xml
@@ -106,7 +106,7 @@
         <dependency>
             <groupId>org.apache.sling</groupId>
             <artifactId>org.apache.sling.api</artifactId>
-            <version>2.21.0-SNAPSHOT</version>
+            <version>2.21.0</version>
             <scope>provided</scope>
         </dependency>
         <dependency>