minor improvement in setup instructions

README.md

@@ -62,7 +62,7 @@ If you have at least Docker, the Java JDK and Gradle installed in appropriate ve
     cd your-hsadmin-ng-directory
     
     source .aliases # creates some comfortable bash aliases, e.g. 'gw'='./gradlew'
-    gw  # downloads the configured Gradle version into the project
+    gw              # initially downloads the configured Gradle version into the project
 
     gw test         # compiles and runs unit- and integration-tests
     

src/test/resources/application.yml

@@ -4,7 +4,7 @@ spring:
             platform: postgres
 
     datasource:
-        url: jdbc:tc:postgresql:13.7-bullseye:///spring_boot_testcontainers
+        url: jdbc:tc:postgresql:15.5-bookworm:///spring_boot_testcontainers
         url-local: jdbc:postgresql://localhost:5432/postgres
         username: postgres
         password: password