meta: correct version setting

[armcknight]

I noticed something about how we version some things while going through the XcodeGen refactor: we were setting CURRENT_PROJECT_VERSION = 8.49.1 for the SentrySDK and SentrySwiftUI framework products. However, that setting is supposed to only be an integer value. The semantic version is supposed to go into MARKETING_VERSION.

We also had a couple disparate places where we would write the semver. So, this unifies them all into a single source of truth, and uses the correct build settings.

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## Unreleased

- correct version setting ([#5139](https://github.com/getsentry/sentry-cocoa/pull/5139))

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Additional details and impacted files

@@                         Coverage Diff                         @@
##             armcknight/ci/ios-swift-cleanup     #5139   +/-   ##
===================================================================
  Coverage                                   ?   92.780%           
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  Files                                      ?       677           
  Lines                                      ?     84271           
  Branches                                   ?     30651           
===================================================================
  Hits                                       ?     78187           
  Misses                                     ?      5983           
  Partials                                   ?       101           

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[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1220.20 ms	1247.38 ms	27.18 ms
Size	22.31 KiB	851.56 KiB	829.25 KiB