build: upgrade depends Boost to 1.77.0

This primarily improves support for external signing, as it includes
multiple bugfixes for Boost Process. As well as various improvements to
the multi-index library.

depends/packages/boost.mk

@@ -1,8 +1,8 @@
 package=boost
-$(package)_version=1.71.0
+$(package)_version=1.77.0
 $(package)_download_path=https://boostorg.jfrog.io/artifactory/main/release/$($(package)_version)/source/
 $(package)_file_name=boost_$(subst .,_,$($(package)_version)).tar.bz2
-$(package)_sha256_hash=d73a8da01e8bf8c7eda40b4c84915071a8c8a0df4a6734537ddde4a8580524ee
+$(package)_sha256_hash=fc9f85fc030e233142908241af7a846e60630aa7388de9a5fafb1f3a26840854
 
 define $(package)_stage_cmds
   mkdir -p $($(package)_staging_prefix_dir)/include && \

doc/dependencies.md

@@ -6,7 +6,7 @@ These are the dependencies currently used by Bitcoin Core. You can find instruct
 | Dependency | Version used | Minimum required | CVEs | Shared | [Bundled Qt library](https://doc.qt.io/qt-5/configure-options.html#third-party-libraries) |
 | --- | --- | --- | --- | --- | --- |
 | Berkeley DB | [4.8.30](https://www.oracle.com/technetwork/database/database-technologies/berkeleydb/downloads/index.html) | 4.8.x | No |  |  |
-| Boost | [1.71.0](https://www.boost.org/users/download/) | [1.64.0](https://github.com/bitcoin/bitcoin/pull/22320) | No |  |  |
+| Boost | [1.77.0](https://www.boost.org/users/download/) | [1.64.0](https://github.com/bitcoin/bitcoin/pull/22320) | No |  |  |
 | Clang<sup>[ \* ](#note1)</sup> |  | [7.0](https://releases.llvm.org/download.html) (C++17 & std::filesystem support) |  |  |  |
 | Fontconfig | [2.12.6](https://www.freedesktop.org/software/fontconfig/release/) |  | No | Yes |  |
 | FreeType | [2.11.0](https://download.savannah.gnu.org/releases/freetype) |  | No |  | [Yes](https://github.com/bitcoin/bitcoin/blob/master/depends/packages/qt.mk) (Android only) |