Update dependency com.sparkjava:spark-core to v2.9.1 (#1701)

Author: renovate-bot

run/logging-manual/pom.xml

@@ -34,7 +34,7 @@ limitations under the License.
     <dependency>
       <groupId>com.sparkjava</groupId>
       <artifactId>spark-core</artifactId>
-      <version>2.8.0</version>
+      <version>2.9.1</version>
     </dependency>
     <!-- [START run_manual_logging_dep] -->
     <dependency>