Improve Lua code to get current version

Ninguém assumiu esta issue ainda.

### How are you using the lua-language-server?

NeoVim

### Which OS are you using?

Other

### What is the issue affecting?

Other

### Expected Behaviour

I would like to get the current version for lua-language-server without `changelog.md` file.

Improve Lua code in `script/version.lua` to get current version (last Git tag).

### Actual Behaviour

When a contributor packages lua-language-server for a distribution (Linux or BSD), the `changelog.md` file is not always included.

In `script/version.lua` file, the current version is defined (function `loadVersion`) with parsing of the `changelog.md` file. **If this file is not present, the returned version is `Unknown`**.

It will be better to get the current version without parsing of `changelog.md` file => get version from the last Git tag or define the current version in `script/version.lua` file.

### Reproduction steps

N/A

### Additional Notes

_No response_

### Log File

_No response_

Comece em script/version.lua, em loadVersion, e inspecione como a versão atual é derivada de changelog.md. Reproduza o caso de empacotamento com changelog.md ausente e, em seguida, verifique se a versão vem da última tag do Git ou de um valor definido explicitamente, em vez de retornar Unknown.

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