feat: Bump the minimum version and remove all #available statements

[borisprimer]

Description

CHKT-1948

• Bump minimum required versions to iOS 13 and Swift 5 in .podspec and in Package.swift files.
• Remove #available statements everywhere
• Breaking changes:
  Well... Yes and no, these changes are indeed breaking but no one will be affected.

Contributor Checklist

• All status checks have passed prior to code review
• I have correctly prefixed one of the following conventional commit titles:
  • fix - patch version update

Reviewer Checklist

• I have verified that the title prefix aligns to the code changes + whether a release is expected after merging the PR

Before Merging

• If introducing a breaking change, I have communicated it internally

Other Stuff

• 3DS PR
• You can find out more about our automation checks here
• Find out more about conventional commits here

[github-actions]

	Warnings
⚠️	This PR doesn't seem to contain any updated Unit Test 🤔. Please consider double checking it.🙏
⚠️	Sources/PrimerSDK/Classes/Core/PrimerHeadlessUniversalCheckout/Managers/Payment Method Managers/PrimerHeadlessBanksComponentWrapper.swift#L29 - SwiftLint rule 'type_name' did not trigger a violation in the disabled region. Please remove the disable command. (superfluous_disable_command)
⚠️	Sources/PrimerSDK/Classes/Core/PrimerHeadlessUniversalCheckout/Managers/Payment Method Managers/PrimerHeadlessUniversalCheckoutComponentWithRedirectManager.swift#L14 - Generic type name should be between 1 and 20 characters long: 'PrimerHeadlessMainComponent' (generic_type_name)
⚠️	Sources/PrimerSDK/Classes/Core/PrimerHeadlessUniversalCheckout/Managers/Payment Method Managers/PrimerHeadlessUniversalCheckoutComponentWithRedirectManager.swift#L14 - Lines should not have trailing whitespace. (trailing_whitespace)
⚠️	Sources/PrimerSDK/Classes/Core/PrimerHeadlessUniversalCheckout/Managers/Payment Method Managers/PrimerHeadlessUniversalCheckoutComponentWithRedirectManager.swift#L18 - Lines should not have trailing whitespace. (trailing_whitespace)

Generated by 🚫 Danger Swift against 576540b

[github-actions]

Appetize link: https://appetize.io/app/akqb2jrlmlxljbdmnr2sjfpn6u

[NQuinn27]

Great work, so good to see this 👏

Question: Should this be a fix: or a feat:, I know we agreed not to make it a breaking change, but did we agree on whether it should be a patch or a minor version bump?

[gitguardian]

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🔎 Detected hardcoded secret in your pull request

GitGuardian id	GitGuardian status	Secret	Commit	Filename
9494411	Triggered	Base64 Generic High Entropy Secret	9b87779	Debug App/Tests/Unit Tests/Data Models/ApayaTests.swift	View secret

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