Project Manager: Managing tags will change the godot project version.

### Tested versions

It is tested in v4.5.1.stable.official, 4.6.beta1 and 4.6.custom-build

### System information

Windows 11

### Issue description

The example is when in the project manager in v4.6, use 'Manage Tags' with a project in other version(v4.5 in the video record), the project will turn into v4.6. And the project can be opened without warning.
The godot version of the project should not changed, stay as is.

https://github.com/user-attachments/assets/1c6ea905-66c5-459b-86cc-79afb05e6240

### Steps to reproduce

* create a new project (v4.5.1) and quit
* use another version(v4.6.beta1) of godot
* select the new project in step 1 and change tags with `Manage Tags`
* the version of the project is changed.

### Minimal reproduction project (MRP)

not neccesary

Start by reproducing the issue in the Godot Project Manager using Manage Tags, comparing the project's version before and after the change. Trace the tag-management flow and verify that changing tags leaves the existing project version unchanged, then repeat the reported steps on the listed Godot versions.

Written by the indexing model from the issue text.