chore: specify that cryptography is experimental

Author: innocenzi

src/Web/Documentation/content/1.x/5-extra-topics/00-roadmap.md

@@ -14,6 +14,7 @@ Given the size of the project, we decided to mark a couple of features as experi
 - [ORM](/main/essentials/database): you can use existing ORMs like [Doctrine](https://www.doctrine-project.org/) as an alternative.
 - [The DateTime component](https://github.com/tempestphp/tempest-framework/tree/main/packages/datetime): you can use [Carbon](https://carbon.nesbot.com/docs/) or [Psl](https://github.com/azjezz/psl) as alternatives.
 - [The mail component](/docs/features/mail): this is a newly added component in Tempest 1.4, and is kept experimental for a couple of feature releases to make sure we can fix all edge cases before calling it "stable".
+- The cryptography component: this is also kept experimental for a couple of feature releases to be able to iterate on the API.
 
 Please note that we're committed to making all of these components stable as soon as possible. To do so, we will need real-life feedback from the community. By marking these components as experimental, we acknowledge that we probably won't get it right from the get-go, and we want to be clear about that up front.