feat: Update zig buildExe snippet for zig 0.15.0+

[estevesnp]

After zig 0.15.0, the build system had some breaking changes, not allowing the ExecutableOptions to directly set the root_source_file, target and optimize fields, instead needing the root_module field to be set. This PR fixes that snippet, updating it to use the b.createModule function (but could also use b.addModule function instead).

Also formats the file according to the .editorconfig file.