doc,cmake: bump Boost minimum dependency

Align Boost minimum versions with current bitcoin/bitcoin master
for both the dependency documentation and CMake configuration:
- Boost 1.73.0 -> 1.74.0

Assisted-by: OpenAI GPT-5.3-Codex

Author: Sjors

cmake/module/AddBoostIfNeeded.cmake

@@ -29,7 +29,7 @@ function(add_boost_if_needed)
     endif()
   endif()
 
-  find_package(Boost 1.73.0 REQUIRED CONFIG)
+  find_package(Boost 1.74.0 REQUIRED CONFIG)
   mark_as_advanced(Boost_INCLUDE_DIR boost_headers_DIR)
   # Workaround for a bug in NetBSD pkgsrc.
   # See: https://github.com/NetBSD/pkgsrc/issues/167.

doc/dependencies.md

@@ -19,7 +19,7 @@ Bitcoin Core requires one of the following compilers.
 
 | Dependency | Releases | Minimum required |
 | --- | --- | --- |
-| [Boost](../depends/packages/boost.mk) | [link](https://www.boost.org/users/download/) | [1.73.0](https://github.com/bitcoin/bitcoin/pull/29066) |
+| [Boost](../depends/packages/boost.mk) | [link](https://www.boost.org/users/download/) | [1.74.0](https://github.com/bitcoin/bitcoin/pull/34107) |
 | CMake | [link](https://cmake.org/) | [3.22](https://github.com/bitcoin/bitcoin/pull/30454) |
 
 ### Runtime