Update Python version requirement in installation guide (#2580)

# Title
Update Python version requirement in installation guide

## Description
I believe spotDL need between Python 3.8 and Python 3.13.
3.7 is unsupported and so is 3.14.
I just changed the installation.md page to reflect this to new users.
No code was changed.


## Motivation and Context
I have used spotdl in the past. I just tried to install it on a new
laptop without python installed. I installed 3.7 because it asks for
"3.7 or above", but it gave me an error message that 3.7 is unsupported.

Author: Silverarmor

docs/installation.md

@@ -15,7 +15,7 @@ install Python & FFmpeg.
 
 - [Visual C++ 2019 redistributable](https://docs.microsoft.com/en-us/cpp/windows/latest-supported-vc-redist?view=msvc-170#visual-studio-2015-2017-2019-and-2022)
   (on Windows)
-- Python 3.7 or above (added to PATH)
+- Python 3.10 - 3.14 (added to PATH)
 - FFmpeg 4.2 or above (added to PATH)
 
 ### Install Python to PATH