Prepare 5.6.4 (Alamofire#3666)

### Issue Link 🔗
This PR prepares the 5.6.4 release.

Prepare 5.6.3 (Alamofire#3664)

### Issue Link 🔗
This PR prepares the 5.6.3 release.

Prepare 5.6.2 (Alamofire#3633)

* Update to 5.6.2.

* Update docs.

Prepare 5.6.1 (Alamofire#3598)

* Version to 5.6.1.

* Update Ruby version.

* Update Jazzy docs.

* Fix date in 5.6.1 changelog.

Prepare 5.6.0 Release (Alamofire#3593)

* Verstion to 5.6.0.

* Update Ruby dependencies.

* Update Jazzy docs.

* Additional versioning.

Prepare 5.5.0 (Alamofire#3527)

* Version to 5.5.0.

* Update Ruby environment.

* Update Jazzy docs.

* Add more documentation links and index support.

* Regenerate docs for other changes.

Prepare 5.4.4 (Alamofire#3496)

* Version to 5.4.4.

* Update Ruby dependencies.

* Update Jazzy docs.

* Fix the screen title for each request in the sample app (Alamofire#3494)

* Add one more PR.

Co-authored-by: Tiago Maia <[email protected]>

Prepare 5.4.3 (Alamofire#3441)

* Version to 5.4.3.

* Update Jazzy docs.

* Formatting.

Prepare 5.4.2 Release (Alamofire#3430)

* Prepare 5.4.2 release.

* Update Jazzy docs.

Update Podspec.