Crash When I drag to enlarge the chart with the demo you provide in section "Line Char (Dual YAxis)"

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## What did you do?
Charts v4.0.2, I click "Line Char (Dual YAxis)" of the demo you provide,and I drag to enlarge the chart, and app terminated,the crash info is attached as a link,what is more,I saw the info of v4.0.2, showing compatible iOS version, minimum iOS10.0,I reduce version into iOS10.0,I failed to install v4.0.2 with cocoapods

ℹ Please replace this with what you did.

## What did you expect to happen?

ℹ Please replace this with what you expected to happen.

## What happened instead?

ℹ Please replace this with of what happened instead.

## Charts Environment
install with cocoapods
**Charts version/Branch/Commit Number:v4.0.2
**Xcode version:13.3
**Swift version:Swift 5
**Platform(s) running Charts:iOS
**macOS version running Xcode:**

## Demo Project

ℹ Please link to or upload a project we can download that reproduces the issue.

Start by reproducing the crash in the Charts v4.0.2 demo using the “Line Char (Dual YAxis)” example and dragging to enlarge the chart on iOS. Review the linked crash screenshot and verify the reported Xcode, Swift, iOS, and CocoaPods conditions; done means the reproduction no longer terminates the app and the iOS 10 installation concern is addressed.

Written by the indexing model from the issue text.