fix(core): docs.rs mobile build

[lucasfernog]

ring is a dependency of rustls and it cannot be compiled by docs.rs when targeting mobile.
we don't actually need rustls anymore since we're not relying on https dev servers.

I've verified this works using https://github.com/rust-lang/docs.rs

See https://docs.rs/crate/tauri/2.3.0/builds/1807696/x86_64-apple-ios.txt and https://docs.rs/crate/tauri/2.3.0/builds/1807696/x86_64-linux-android.txt

[github-actions]

Package Changes Through 5ab38af

There are 1 changes which include tauri with patch

Planned Package Versions

The following package releases are the planned based on the context of changes in this pull request.

package	current	next
tauri	2.3.1	2.3.2

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