Fix package name of spring boot JarLauncher class in jgit.sh

The class moved to this package in spring 3.2.0.
See
https://stackoverflow.com/questions/77279480/org-springframework-boot-loader-jarlauncher-cannot-be-found-but-org-springframe
spring-projects/spring-boot#37667
https://docs.spring.io/spring-boot/docs/3.2.0/reference/html/executable-jar.html#appendix.executable-jar.launching.manifest

Bug: jgit-157
Change-Id: Ie1aaef2cd9443ee37b5ff6cd83fcd74e23b3e3fa

Author: msohn

org.eclipse.jgit.pgm/jgit.sh

@@ -110,9 +110,9 @@ then
 	LESS=${LESS:-FSRX}
 	export LESS
 
-	"$java" $java_args org.springframework.boot.loader.JarLauncher "$@" | $use_pager
+	"$java" $java_args org.springframework.boot.loader.launch.JarLauncher "$@" | $use_pager
 	exit
 else
-  exec "$java" $java_args org.springframework.boot.loader.JarLauncher "$@"
+  exec "$java" $java_args org.springframework.boot.loader.launch.JarLauncher "$@"
   exit 1
 fi