wrong version into meson build file

[bioinfornatics]

Dear the meson build file have to be updated to match the same tag.
Currently it is 3.0.2 while the file contains 3.0.1

maybe you would have to add a unit test to check automatically

[denizzzka]

Another proposal: just remove version from meson.build in favor to "wrap" subsystem facility abilities:

[wrap-git]
directory=allocator
url=https://github.com/dlang-community/stdx-allocator.git
revision=v3.1.0-beta.2

Advantage is that end user can easily change version by creating their own internal wrap file