fix: support asio 1.33

[shirzartenwer]

Asio changed io_serviceto io_context since 1.33

Summary

Since Asio 1.33, io_service is changed to io_context , so this change is needed to support newer asio version.

Details

Changed the code where io_service is used to io_context. Tested this bug exists by first introducing a flag that made the build fail in this #311

Motivation and Context

How Has This Been Tested?

cmake --build build --target test has been run succesfully, so all the unit test is done.

Types of changes

• Bug fix (non-breaking change which fixes an issue).
• New feature (non-breaking change which adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).

Checklist:

• It is my own work, its copyright is implicitly assigned to the project and no substantial part of it has been copied from other sources (including Stack Overflow). In rare occasions this is acceptable, like in CMake modules where the original copyright information should be kept.
• I'm using the same code standards as the existing code (indentation, spacing, variable naming, ...).
• I've added tests for my code.
• I have verified whether my change requires changes to the documentation
• My change either requires no documentation change or I've updated the documentation accordingly.
• My branch has been rebased to main, keeping only relevant commits.