Increase required cmake version to 3.15

[memark]

Increase required cmake version to 3.15:

Compatibility with CMake < 3.10 will be removed from a future version of
CMake.

No one seems to be using anything older than 3.15:
neovim/neovim#24004 (comment)

Or 3.22 for that matter. FYI 3.15 is currently the lowest version that doesn't generate deprecation warnings in the latest versions of CMake. I'm all for raising it further to 3.22 if you don't object. (Then we can also raise it downstream in https://github.com/RediSearch/RediSearch, gaining some new features.)

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Note

Low Risk
Low risk build-system-only change, but it will break CMake-based builds for users pinned to versions < 3.15.

Overview
Raises the project’s minimum supported CMake version from 3.7.0 to 3.15.0.

Updates CI to stop testing 3.7.0 and instead validate builds against 3.15.0 as the new minimum, plus newer CMake versions.

^{Written by Cursor Bugbot for commit 74b8781. This will update automatically on new commits. Configure here.}

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