Revert "refactor: Update to Boost 1.88 and 1.86" (#5872)

This change reverts #5570, and then also makes the same changes as was done in #5759 to revert to Boost 1.83. We would like to expose Boost 1.88 to more in-depth testing, but with release 3.0.0 coming out soon there is insufficient time to do so, hence the reversion to Boost 1.83 (skipping Boost 1.86 as it has a bug in the executors).

conanfile.py

@@ -100,13 +100,11 @@ class Xrpl(ConanFile):
     def configure(self):
         if self.settings.compiler == 'apple-clang':
             self.options['boost'].visibility = 'global'
-        if self.settings.compiler in ['clang', 'gcc']:
-            self.options['boost'].without_cobalt = True
 
     def requirements(self):
         # Conan 2 requires transitive headers to be specified
         transitive_headers_opt = {'transitive_headers': True} if conan_version.split('.')[0] == '2' else {}
-        self.requires('boost/1.88.0', force=True, **transitive_headers_opt)
+        self.requires('boost/1.83.0', force=True, **transitive_headers_opt)
         self.requires('date/3.0.4', **transitive_headers_opt)
         self.requires('lz4/1.10.0', force=True)
         self.requires('protobuf/3.21.12', force=True)
@@ -177,7 +175,6 @@ class Xrpl(ConanFile):
             'boost::filesystem',
             'boost::json',
             'boost::program_options',
-            'boost::process',
             'boost::regex',
             'boost::system',
             'boost::thread',