build: bump minimum cmake version to 3.13

The benefits are primarily being able to use FetchContent, which allows
for a more flexible dependency handling. Other various quality-of-life
features such as `-B` and `-S` flags are also included.

This also removes broken `--version` generation as it does not work for
version 3.10 and 3.11 due to the `JOIN` generator expression.

Reference: https://github.com/neovim/neovim/issues/24004

.github/workflows/build.yml

@@ -36,8 +36,8 @@ jobs:
     runs-on: ubuntu-22.04
     timeout-minutes: 15
     env:
-      CMAKE_URL: 'https://cmake.org/files/v3.10/cmake-3.10.0-Linux-x86_64.sh'
-      CMAKE_VERSION: '3.10.0'
+      CMAKE_URL: 'https://cmake.org/files/v3.13/cmake-3.13.0-Linux-x86_64.sh'
+      CMAKE_VERSION: '3.13.0'
     steps:
       - uses: actions/checkout@v4
       - uses: ./.github/actions/setup