Why iOS 13.x below the 13.4 version is still using TLS 1.0/1.1 and how to force it to use TLS 1.2 and above?

We are doing some research on our inbound TLS traffic and we are currently seeing a small percentage of iOS 13.x below the 13.4 version that are still using TLS 1.0 or TLS 1.1 .

Do you know why this recent OS is still using these deprecated protocols and how to force it to use at least the TLS 1.2 version?

Source: Ios