prerelease package v3.1.2 broken

[akstrfn]

$ wget https://github.com/microsoft/LightGBM/archive/v3.1.2.zip
$ unzip unzip v3.1.2.zip && cd LightGBM-3.1.2
$ cmake -H. -Bbuild && cmake --build build

... snip ...

 /tmp/LightGBM-3.1.2/include/LightGBM/utils/common.h:35:10: fatal error: ../../../external_libs/fmt/include/fmt/format.h: No such file or directory
   35 | #include "../../../external_libs/fmt/include/fmt/format.h"
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.

Likely the change introduced in PR #3639 requires change of workflow when making the release package.

[StrikerRUS]

We are so sorry, but that "release" was accidental! There are no plans to make 3.1.2 release actually. Next release should be 3.2.0 later. For now please keep using 3.1.1 or latest commits from the master branch.

[github-actions]

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