Merge pull request #17976 from nebhale

* gh-17976:
  Use exec when launching the JVM in CLI's shell script

Closes gh-17976

spring-boot-project/spring-boot-cli/src/main/executablecontent/bin/spring

@@ -113,4 +113,4 @@ if $cygwin; then
 fi
 
 IFS=" " read -r -a javaOpts <<< "$JAVA_OPTS"
-"${JAVA_HOME}/bin/java" "${javaOpts[@]}" -cp "$CLASSPATH" org.springframework.boot.loader.JarLauncher "$@"
+exec "${JAVA_HOME}/bin/java" "${javaOpts[@]}" -cp "$CLASSPATH" org.springframework.boot.loader.JarLauncher "$@"