My WiFi says weak security on my iPad and iPhone since last update
WiFi on pad and phone saw weak security since last updates
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Your iPad is no less secure today than it was prior to the update to iPadOS14. However, your iPad is now better able to [warn] bring to your attention security deficiencies of your WiFi network and iPad settings.
This support page will describe the more secure (recommended) settings for WiFi:
Recommended settings for Wi-Fi routers and access points – Apple Support
It is possible that your WiFi Router may be too old to be capable of being configured to more secure settings. As such, you can either configure the most secure settings that your Router will support - or replace your Router with something more advanced that provides better security configuration options.
Whilst WPA3 is the newest standard, you should aim to use WPA2 as a minimum.