Bump spark-core from 2.3 to 2.7.2 in /api/java/deployment (github#297)

Bumps [spark-core](https://github.com/perwendel/spark) from 2.3 to 2.7.2.
- [Release notes](https://github.com/perwendel/spark/releases)
- [Commits](perwendel/spark@2.3...2.7.2)

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api/java/deployment/pom.xml

@@ -79,7 +79,7 @@
         <dependency>
             <groupId>com.sparkjava</groupId>
             <artifactId>spark-core</artifactId>
-            <version>2.3</version>
+            <version>2.7.2</version>
         </dependency>
         <dependency>
             <groupId>com.google.code.gson</groupId>