Bump spark-core from 2.5 to 2.7.2

Bumps [spark-core](https://github.com/perwendel/spark) from 2.5 to 2.7.2.
- [Release notes](https://github.com/perwendel/spark/releases)
- [Commits](perwendel/spark@2.5...2.7.2)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pom.xml

@@ -74,7 +74,7 @@
             <dependency>
                 <groupId>com.sparkjava</groupId>
                 <artifactId>spark-core</artifactId>
-                <version>2.5</version>
+                <version>2.7.2</version>
                 <exclusions>
                     <exclusion>
                         <groupId>org.slf4j</groupId>