Quote $jarfile when creating arguments in launch script

Previously, if the pathname of fully executable contained any space
characters, the launch script would fail to locate the jar file

This commit fixes this issue by quoting the jarfile.

Closes gh-7535

spring-boot-tools/spring-boot-loader-tools/src/main/resources/org/springframework/boot/loader/tools/launch.script

@@ -133,7 +133,7 @@ else
     exit 1
 fi
 
-arguments=(-Dsun.misc.URLClassPath.disableJarChecking=true $JAVA_OPTS -jar $jarfile $RUN_ARGS "$@")
+arguments=(-Dsun.misc.URLClassPath.disableJarChecking=true $JAVA_OPTS -jar "$jarfile" $RUN_ARGS "$@")
 
 # Action functions
 start() {