Log Message:
kore: update to 4.2.0.

Changes:

- Removed OpenSSL 1.0.2 support.
- TLS 1.3 is now the default for tls_version.
- Fixed support for Python 3.10 and higher.
- Kore ships with the ffdhe4096 DH parameters.
- Changed the routing configuration context.
- JSON API error handling functions no longer take a kore_json context as
  parameter.
- Removed stale out-of-date examples.
- Changed the way the workers log to the parent process.
- Changed kore.domain() and kore.server() for Python API, name is now a
  keyword, if omitted defaults to "default".
- Added new HTTP APIs for obtaining headers as native C types.
- http_state_create() no longer takes an onfree callback.
- Updated log levels in the ACME process.
- New logfile configuration option, allowing all Kore logs to go to the given
  file instead of stdout.
- New kodev commands: cflags, ldflags and gen.
- New TLS_BACKEND option to compile without TLS.
- New privsep configuration context.
- New @kore.route("url", methods=[]) decorator in Python API.
- New http_response_json() API function.
- New http_response_close() API function.
- New kore_signal_trap() API function.
- New kore_worker_signal() API hook.
- New kore.connection.x509dict in Python API.
- New koreapp.workerstop, koreapp.workerstart hooks for Python.
- New kore.task_id() for Python, returning current coroutine ID.
- New kore.sigtrap() for Python, trapping a given signal.
- New kore.privsep() for Python, for setting up the new privsep
  configuration.
- New curlopt keyword for kore.httpclient, allowing setting of specific curl
  options directly into it.
- New TARGET_PLATFORM environment variable for cross building Linux.
- New on_body, on_headers and on_free route handlers.
- New kore_mem_zero() function.
- New http.protocol() for Python API.
- Removed run_as and root configuration options.
- Removed keymgr_runas and keymgr_root configuration options.
- Removed acme_runas and acme_root configuration options.
- Added ability for parent to send messages via the msg framework to workers.
- Added several new system calls to seccomp whitelist filters.
- Added support for overriding previously set headers with
  http_response_header().
- Added support for 100 in http_response_* APIs.
- Added new "docker" deployment target for Python.
- Updated the pgsql code to understand PGRES_PIPELINE_SYNC and
  PGRES_PIPELINE_ABORTED.
- Modified Kore child handling code to wait for processes in its worker
  process group.
- And much more..

Bug fixes:

- All kore_pool elements are now always properly aligned on a boundary of 8.
- execve() now takes an environment pointer instead of NULL.
- Fixed a problem in kore.socket.recvfrom() Python API.
- Fixed several wrong log messages while parsing configuration.
- Fixed a bug in the kore_http client related to OPTIONS and DELETE methods.
- Fixed potential uninitialised parameter in accesslog.
- Fixed small bugs in several examples.
- Fix bug in several kore_json_create_*() API functions with regards to
  variadic arguments.
- Fixed dependencies in the Kore Makefile.
- Fixed how Kore obtains paths to openssl on Mac platforms.