chore(deps): update dependency org.jacoco:jacoco-maven-plugin to v0.8.15 (#662)

* chore(deps): update dependency org.jacoco:jacoco-maven-plugin to v0.8.15

* refactor: fix Sonar issues

---------

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Giannin <puzzle@giannin.ch>

Author: renovate[bot]

backend/pom.xml

@@ -211,7 +211,7 @@
 			<plugin>
 				<groupId>org.jacoco</groupId>
 				<artifactId>jacoco-maven-plugin</artifactId>
-				<version>0.8.14</version>
+				<version>0.8.15</version>
 				<configuration>
 					<excludes>
 						<exclude>ch/puzzle/pcts/model/**</exclude>

backend/src/test/java/ch/puzzle/pcts/service/validation/ExperienceValidationServiceTest.java

@@ -182,7 +182,6 @@ void shouldThrowExceptionWhenEndDateIsBeforeStartDate() {
                     assertThrows(PCTSException.class, () -> service.validateOnCreate(experience)));
 
         exceptions
-                .stream()
                 .forEach(exception -> assertEquals(List
                         .of(Map
                                 .of(FieldKey.ENTITY,