Compilation with fmt 12.x fails

### Describe the bug

`fmt::localtime` was removed after deprecation in previous versions, in favor of `std::localtime`.

I noticed because Arch Linux upgraded to fmt 12.x yesterday (but afaiu, fmt is pulled in as a git submodule for this project)

### Expected behavior

For `pcsx-redux` to compile with fmt 12.x

### Steps to reproduce the bug

1. Try to compile
2. Observe fmt::localtime compilation errors

### Operating System

Arch Linux

### PCSX-Redux version

main/master

### CPU model

Intel Core 13900T

### GPU model & Drivers

NVIDIA 4090

### BIOS version

SCPH1001

### Options

- [ ] Dynarec CPU
- [ ] 8MB
- [ ] OpenGL GPU
- [ ] Fastboot
- [ ] Debugger

### Iso checks

_No response_

### Logs

_No response_

### Additional information

_No response_