[RELEASE] c-ares 1.34.8

[Brad House]

## c-ares version 1.34.8 - July 7 2026

This is a bugfix release.

Bugfixes:
* Revert "Mark parameters in callbacks as const" which shipped in 1.34.7.
   Changing the parameter types of the `ares_callback`, 
`ares_host_callback`,
   and `ares_nameinfo_callback` function pointer typedefs was an unintended
   API break: existing applications with the historical non-const callback
   signatures no longer compiled, particularly in C++ where function pointer
   types must match exactly. The read-only nature of the callback parameters
   is now documented instead.
   [PR #1244](https://github.com/c-ares/c-ares/pull/1244)