Support for 3.9 about gr-tempest HOT 5 OPEN

We're about to release some new funcionalities. Once that's up and running, we'll take a look at how to make it 3.9-compatible.

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The guide for porting from GNU Radio 3.8 to 3.9 is here:
https://wiki.gnuradio.org/index.php?title=GNU_Radio_3.9_OOT_Module_Porting_Guide

3.10 has now been released, but most out-of-tree modules do not require changes to be compatible.
https://wiki.gnuradio.org/index.php?title=GNU_Radio_3.10_OOT_Module_Porting_Guide

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Support for gnuradio 3.9 - 3.11 has been added via pr #16

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@bkerler I'm having issues with the PR using gnuradio 3.9.5.0 (built from source, installed globally).
First, I changed the gnuradio package version in CMakeLists.txt from 3.10 to 3.9, but seems that there are some incompatibilities:

CMake Error at CMakeLists.txt:47 (include):
  include could not find load file:

    GrMinReq


CMake Error at CMakeLists.txt:53 (include):
  include could not find load file:

    GrCompilerSettings

The lines look similar to ones in gnuradio's CMakeLists.txt that were introduced in version 3.10.
Additionally, I got multiple errors similar to this one:

CMake Error at /usr/local/lib/cmake/gnuradio/GrPybind.cmake:195 (file):
  file MD5 failed to read file
  "/home/user/SDR/gr-tempest/python/tempest/bindings/../../../include/tempest/fine_sampling_synchronization.h":
  No such file or directory
Call Stack (most recent call first):
  python/tempest/bindings/CMakeLists.txt:39 (GR_PYBIND_MAKE_OOT)

The path should be include/gnuradio/tempest/fine_sampling_synchronization.h. Not sure what the root cause is since I didn't look into it at this time.

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Yes, some lines were added for gnuradio 3.10. I might port it specifically to 3.9 if that is really needed.

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