Boot: Update MCUboot url

MCUboot URL was changed from https://github.com/JuulLabs-OSS/mcuboot
to https://github.com/mcu-tools/mcuboot

Signed-off-by: Tamas Ban <tamas.ban@arm.com>
Change-Id: If5e3d103ed420258046b7cf1071d36bf5e883476
diff --git a/lib/ext/mcuboot/CMakeLists.txt b/lib/ext/mcuboot/CMakeLists.txt
index 822843f..d26d20c 100644
--- a/lib/ext/mcuboot/CMakeLists.txt
+++ b/lib/ext/mcuboot/CMakeLists.txt
@@ -15,7 +15,7 @@
 
 if ("${MCUBOOT_PATH}" STREQUAL "DOWNLOAD")
     FetchContent_Declare(mcuboot
-        GIT_REPOSITORY https://github.com/JuulLabs-OSS/mcuboot.git
+        GIT_REPOSITORY https://github.com/mcu-tools/mcuboot.git
         GIT_TAG ${MCUBOOT_VERSION}
         GIT_SHALLOW FALSE
         GIT_PROGRESS TRUE