change java version to 1.8

.gitlab-ci.yml

-image: maven:3.8.3-openjdk-17
+image: maven:3.8.3-jdk-8
 
 
 build:

CityDoctorParent/pom.xml

@@ -10,8 +10,8 @@
 
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-		<maven.compiler.source>17</maven.compiler.source>
-		<maven.compiler.target>17</maven.compiler.target>
+		<maven.compiler.source>1.8</maven.compiler.source>
+		<maven.compiler.target>1.8</maven.compiler.target>
 		<revision>${project.version}</revision>
 		<nonMavenLibsPath>${project.baseUri}../non-maven-libs</nonMavenLibsPath>
 	</properties>