v2.2.8 Boost 1.84 release

v2.2.8 13th December 2023 (Boost 1.84) [release]

Enhancements:

• cmake 3.9 is now the minimum required for standalone Outcome. This fixes a long standing
  cmake issue with probing for standard library facilities. cmake 3.9 is what RHEL7 ships with,
  when RHEL7 EOLs we may raise the minimum cmake version at that point.

Bug fixes:

• There was a bug in the Outcome C++ coroutine awaitables whereby we were over eagerly resuming
  execution of coroutines which return one of our awaitables. It is surprising how many years have
  passed before this was noticed, but it is now fixed. It is believed that this has been fixed
  without affecting ABI stability, however mixing old Outcome and new Outcome in the same binary
  without recompiling all the C++ coroutine code to use new Outcome will not fix the bug.

#291

• A Result or Outcome with void value type and move-only non-value type was only usable in
  const use cases, due to the lack of provision of non-const member functions in relevant observers
  injection layers for the void specialisation. The missing non-const member functions have now
  been added.

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Use the 'all-sources' tarball below, NOT the github generated one which is missing dependencies: