ci: bump iOS deployment target to 15.0 in test app Podfile

Plugin requires iOS 15.0 (StoreKit 2) but Capacitor 6/7 Podfiles
default to 13.0/14.0.

Author: j3k0

.github/workflows/build-capacitor-ios.yml

@@ -55,6 +55,9 @@ jobs:
       - name: Install plugin
         run: |
           cd test-cap-app
+          # Plugin requires iOS 15.0 (StoreKit 2) — bump Podfile target
+          sed -i '' "s/platform :ios, '13.0'/platform :ios, '15.0'/" ios/App/Podfile || true
+          sed -i '' "s/platform :ios, '14.0'/platform :ios, '15.0'/" ios/App/Podfile || true
           cp "$GITHUB_WORKSPACE/www/store.js" "$GITHUB_WORKSPACE/capacitor/www/store.js"
           cp "$GITHUB_WORKSPACE/www/store.d.ts" "$GITHUB_WORKSPACE/capacitor/www/store.d.ts"
           npm install "$GITHUB_WORKSPACE/capacitor"