The PhpSpec PHAR version is incorrect

The version displayed for 8.1.0 is 8.0.0:

```shell
# Download 8.1.0
wget --quiet https://github.com/phpspec/phpspec/releases/download/8.1.0/phpspec.phar --output-document=phpspec.phar
chmod +x phpspec.phar
./phpspec.phar # 8.0.0
```