Bump buildroot binutils version

Since buildroot commit f4187bd, the support of binutils 2.39 has been
dropped and updated to version 2.42. This commit updates the buildroot
configuration.

Author: ChinYikMing

configs/buildroot.config

@@ -22,7 +22,7 @@ BR2_TOOLCHAIN_BUILDROOT_GLIBC=y
 BR2_TOOLCHAIN_BUILDROOT_LIBC="glibc"
 # BR2_TOOLCHAIN_BUILDROOT_CXX is not set
 BR2_KERNEL_HEADERS_6_1=y
-BR2_BINUTILS_VERSION_2_39_X=y
+BR2_BINUTILS_VERSION_2_42_X=y
 # BR2_BINUTILS_GPROFNG is not set
 BR2_GCC_VERSION_12_X=y
 BR2_EXTRA_GCC_CONFIG_OPTIONS="--enable-softfloat"