cmake/modules/FindBoost: add support for Boost 1.88.0

cmake/modules/FindBoost: add support for Boost 1.88.0

Add Boost 1.88.0 to the supported versions list and update component
dependencies to eliminate build warnings.

This resolves the following warning when building with Boost 1.88.0:

```
-- Found Boost: /usr/include (found suitable version "1.88.0", minimum required is "1.73.0")
CMake Warning at cmake/modules/FindBoost.cmake:1413 (message):
  New Boost version may have incorrect or missing dependencies and imported
  targets
Call Stack (most recent call first):
  cmake/modules/FindBoost.cmake:1538 (_Boost_COMPONENT_DEPENDENCIES)
  cmake/modules/FindBoost.cmake:2157 (_Boost_MISSING_DEPENDENCIES)
  src/CMakeLists.txt:461 (_find_package)
  src/seastar/cmake/SeastarDependencies.cmake:136 (find_package)
  src/seastar/CMakeLists.txt:395 (seastar_find_dependencies)
```

Boost 1.88.0 was released on April 3, 2025, and is already available
in some distributions. Since many distributions don't yet ship Boost's
native CMake configuration files, our vendored FindBoost.cmake module
needs updating to handle this version.

The component dependencies were updated following the scanning procedure
documented in the _Boost_COMPONENT_DEPENDENCIES() function. The change
will be upstreamed to CMake shortly.

Signed-off-by: Kefu Chai <tchaikov@gmail.com>