Use SPM product AlamofireDynamic to resolve a privacy manifest issue

[fraune]

Switched the SPM package product to AlamofireDynamic, which is required for apps to inherit the Alamofire privacy manifest

For example, this change will resolve the following email when a project imports RxAlamofire.

This change is also available for testing, as an unofficial release under my fork: https://github.com/fraune/RxAlamofire/releases/tag/v6.1.3

[rxswiftcommunity[bot]]

	Warnings
:warning:	It looks like code was changed without adding anything to the Changelog. If this is a trivial PR that doesn't need a changelog, add #trivial to the PR title or body.

Generated by :no_entry_sign: dangerJS

[fraune]

I don't want to presume that this will be part of a particular release. If a maintainer can help me update the changelog, that would be appreciated!