Run Coverage with iPhone 15 (#197)

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## What
Update Coverage.yaml to use iPhone 15 instead of iPhone 14
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## Why
iPhone 14 appears no longer available. I don't know how that broke all of a sudden. Maybe pinning the version of Python or something else could help.

I choose iPhone 15 because it was available when running `xcrun simctl list devices`

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## Test Plan
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The Coverage check passes.

## How
Can be merged in once approved.
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Author: devinmorgan

.github/workflows/Coverage.yaml

@@ -31,9 +31,10 @@ jobs:
           xcodebuild test \
             -project Sample/SampleForageSDK.xcodeproj \
             -scheme ForageSDK \
-            -destination 'platform=iOS Simulator,name=iPhone 14 Pro,OS=latest' \
+            -destination 'platform=iOS Simulator,name=iPhone 15 Pro,OS=latest' \
             -enableCodeCoverage YES
 
+
       - name: Generate XML coverage report (Cobertura)
         run: slather coverage -x