SoftAP appears to default to TKIP.

## Note
This issue is transferred from WLED https://github.com/Aircoookie/WLED/issues/4052 I'm not in posession of the hardware, which is required for testing this. I found the issue through a packet capture and reported it at WLED, where the maintainers noted, that it's an issue in this library. I filled out the fields to my best knowledge, but this is definitely a software issue, across all boards.
### Basic Infos

- [x] This issue complies with the [issue POLICY doc](https://github.com/esp8266/Arduino/blob/master/POLICY.md).
- [x] I have read the documentation at [readthedocs](https://arduino-esp8266.readthedocs.io/en/latest) and the issue is not addressed there.
- [?] I have tested that the issue is present in current master branch (aka latest git).
- [x] I have searched the issue tracker for a similar issue.
- [x] If there is a stack dump, I have decoded it.
- [x] I have filled out all fields below.

#### Platform

- Hardware: Any
- Core Version: 4.2.1
- Development Env: PlatformIO
- Operating System: Any

### Settings in IDE

- Module: Any
- Flash Mode: Any
- Flash Size: Any
- lwip Variant: Any
- Reset Method: Any
- Flash Frequency: Any
- CPU Frequency: Any
- Upload Using: Any
- Upload Speed: Any

### Problem Description

When operating a SoftAP initialized With `WiFi::SoftAP`, the encryption defaults to TKIP aka WPA1, which has been deprecated for over a decade by now, due to it being insecure. Alternatively, CCMP aka WPA2 should be used.
I'm aware, that this might be for backwards compatibility, but if TKIP is used, a warning should be emitted.
If WPA/WPA2 is used, this still presents a risk, because TKIP is implicitly used as the group cipher, which makes all group addressed traffic vulnerable.

### [MCVE](https://stackoverflow.com/help/mcve) Sketch
See minimal WiFi SoftAP example.