Update zmq to 4.3.1

Addresses https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-6250

depends/packages/zeromq.mk

@@ -1,8 +1,8 @@
 package=zeromq
-$(package)_version=4.2.5
+$(package)_version=4.3.1
 $(package)_download_path=https://github.com/zeromq/libzmq/releases/download/v$($(package)_version)/
 $(package)_file_name=$(package)-$($(package)_version).tar.gz
-$(package)_sha256_hash=cc9090ba35713d59bb2f7d7965f877036c49c5558ea0c290b0dcc6f2a17e489f
+$(package)_sha256_hash=bcbabe1e2c7d0eec4ed612e10b94b112dd5f06fcefa994a0c79a45d835cd21eb
 $(package)_patches=0001-fix-build-with-older-mingw64.patch 0002-disable-pthread_set_name_np.patch
 
 define $(package)_set_vars

doc/dependencies.md

@@ -26,5 +26,5 @@ These are the dependencies currently used by Bitcoin Core. You can find instruct
 | Qt | [5.9.7](https://download.qt.io/official_releases/qt/) | [5.2](https://github.com/bitcoin/bitcoin/pull/14725) | No |  |  |
 | XCB |  |  |  |  | [Yes](https://github.com/bitcoin/bitcoin/blob/master/depends/packages/qt.mk#L87) (Linux only) |
 | xkbcommon |  |  |  |  | [Yes](https://github.com/bitcoin/bitcoin/blob/master/depends/packages/qt.mk#L86) (Linux only) |
-| ZeroMQ | [4.2.5](https://github.com/zeromq/libzmq/releases) | 4.0.0 | No |  |  |
+| ZeroMQ | [4.3.1](https://github.com/zeromq/libzmq/releases) | 4.0.0 | No |  |  |
 | zlib | [1.2.11](https://zlib.net/) |  |  |  | No |