heyoka 6.1.0

This is a quick release containing:

• a fix for a likely clang-17 bug which manifests itself with exceptions being thrown during (de)serialisation, and
• a fix for symbols from heyoka and its dependencies not being available to the JIT runtime when the heyoka shared library is dlopen()-ed with RTLD_LOCAL.

The minor version number has been bumped out of an abundance of caution, but this release does not contain any new user-facing features.

As usual, the full changelog is available here:

https://bluescarni.github.io/heyoka/changelog.html