libubox: update to Git HEAD (2025-07-23)

b7acc8e6fd5e remove compatibility code for older json-c versions
a1acd99f2eb7 udebug: remove obsolete debug message
49056d178f42 udebug: fix issue with snapshot of remote ring

Signed-off-by: Felix Fietkau <[email protected]>

package/libs/libubox/Makefile

@@ -5,9 +5,9 @@ PKG_RELEASE=1
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL=$(PROJECT_GIT)/project/libubox.git
-PKG_MIRROR_HASH:=e10144cfae155cf2ae5fdf167bd575dbf34c7751ddb112554b6962003f989b36
-PKG_SOURCE_DATE:=2024-12-19
-PKG_SOURCE_VERSION:=3868f47c8f6c6570e62a3cdf8a7f26ffb1a67e6a
+PKG_MIRROR_HASH:=51b48648a3a64eed74bcb1ab352aaad6ef7679a574df4445d2914b990aba5bbf
+PKG_SOURCE_DATE:=2025-07-23
+PKG_SOURCE_VERSION:=49056d178f42da98048a5d4c23f83a6f6bc6dd80
 PKG_ABI_VERSION:=$(call abi_version_str,$(PKG_SOURCE_DATE))
 CMAKE_INSTALL:=1