VGA emulation doesn't support additional text modes including flashing
## Host environment
- Operating system: Ubuntu in WSL2 with X-Forwarding
- OS/kernel version: `22.04.1`
- Architecture: `x86_64`
- QEMU flavor: `qemu-system-i386`
- QEMU version: `6.2.0`
- QEMU command line:
```
qemu-system-i386 -cdrom os.iso
```
## Emulated/Virtualized environment
- Operating system: [TheDevMinerTV/os](https://github.com/TheDevMinerTV/os)
- OS/kernel version: [git commit `919f8d46136138bf32e2131c17e9161158bbccb7`](https://github.com/TheDevMinerTV/os/tree/919f8d46136138bf32e2131c17e9161158bbccb7)
- Architecture: `i386`
- Download: https://github.com/TheDevMinerTV/os/actions/runs/4641628674 -> Artifacts -> ISO at the bottom
## Description of problem
All of my physical machines use black as `DarkGray` and have the text starting from `White+DarkGray` blink (watch the video below). The ISO I'm using is a minimal kernel I've written to check VGA text mode (provided by the BIOS at `0xb8000` with a 80x25 resolution) handling on multiple emulators and machines.
Changing the emulated CPU and display driver doesn't change this behaviour.
Hyper-V: color test shows correct colors, all text starting from `White+DarkGray` is blinking

AMD Athlon 64 X2 6000+ + NVIDIA Quadro 400 on actual hardware: same as Hyper-V
I've tested this with multiple physical GPUs and they all have the same behaviour and color palette.

QEMU: dark gray is the wrong color and the text doesn't blink
Changing the emulated device doesn't change this behaviour.

I think QEMU should emulate the hardware as close as possible and therefore atleast have the blinking text.
Consider this a low priority issue.
## Steps to reproduce
1. Download ISO from the link above
2. Run the QEMU command above
3. See the text not blink
## Additional information

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