Merge pull request #344 from apache/dependabot/maven/org.openjdk.nashorn-nashorn-core-15.7

Bump org.openjdk.nashorn:nashorn-core from 15.6 to 15.7

Author: garydgregory

pom.xml

@@ -391,7 +391,7 @@
         <dependency>
           <groupId>org.openjdk.nashorn</groupId>
           <artifactId>nashorn-core</artifactId>
-          <version>15.6</version>
+          <version>15.7</version>
         </dependency>
         <!-- Graal's JS support is not 100% compatible with Java 8.
         <dependency>