Bump libcurl version

depends/packages/libcurl.mk

@@ -1,9 +1,9 @@
 package=libcurl
-$(package)_version=7.67.0
+$(package)_version=7.68.0
 $(package)_dependencies=openssl
 $(package)_download_path=https://curl.haxx.se/download
 $(package)_file_name=curl-$($(package)_version).tar.gz
-$(package)_sha256_hash=52af3361cf806330b88b4fe6f483b6844209d47ae196ac46da4de59bb361ab02
+$(package)_sha256_hash=1dd7604e418b0b9a9077f62f763f6684c1b092a7bc17e3f354b8ad5c964d7358
 $(package)_config_opts_linux=--disable-shared --enable-static --prefix=$(host_prefix) --host=$(HOST)
 $(package)_config_opts_mingw32=--enable-mingw --disable-shared --enable-static --prefix=$(host_prefix) --host=x86_64-w64-mingw32
 $(package)_config_opts_darwin=--disable-shared --enable-static --prefix=$(host_prefix)