fix: update PostHog to 3.62.0 to fix SwiftDriver compilation error

- Pin PostHog to 3.62.0 (vendored PLCrashReporter, drops external
  plcrashreporter dependency that fails with Xcode 26/Swift 6)
- Update project.yml and pbxproj minimumVersion
- Delete Package.resolved to force clean SPM resolution
- Add -resolvePackageDependencies step in CI workflow
- Add -skipPackagePluginValidation to build command
- Fix docs/ci-cd-setup.md manual build command

tabatago-swift/project.yml

@@ -27,7 +27,7 @@ packages:
     from: "5.0.0"
   PostHog:
     url: https://github.com/PostHog/posthog-ios
-    from: "3.0.0"
+    from: "3.62.0"
 
 targets:
   TabataGo: