uclibc-ng: bump version here, too

target/config/Config.in.libc

@@ -236,7 +236,7 @@ config ADK_TARGET_LIBC
 
 config ADK_LIBC_VERSION
 	string
-	default "1.0.27" if ADK_TARGET_LIB_UCLIBC_NG_1_0_27
+	default "1.0.28" if ADK_TARGET_LIB_UCLIBC_NG_1_0_28
 	default "1.1.18" if ADK_TARGET_LIB_MUSL_1_1_18
 	default "2.26" if ADK_TARGET_LIB_GLIBC_2_26
 	default "2.4.0" if ADK_TARGET_LIB_NEWLIB_2_4_0