chore: update powersync-sqlite-core (#12)

* chore: update powersync-sqlite-core

* chore: update package

Author: DominicGBauer

Demo/PowerSyncExample.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved

@@ -17,8 +17,8 @@ let package = Package(
             targets: ["PowerSync"]),
     ],
     dependencies: [
-        .package(url: "https://github.com/powersync-ja/powersync-kotlin.git", exact: "1.0.0-BETA11.0"),
-        .package(url: "https://github.com/powersync-ja/powersync-sqlite-core-swift.git", "0.3.1"..<"0.4.0"),
+        .package(url: "https://github.com/powersync-ja/powersync-kotlin.git", exact: "1.0.0-BETA15.0"),
+        .package(url: "https://github.com/powersync-ja/powersync-sqlite-core-swift.git", "0.3.8"..<"0.4.0")
     ],
     targets: [
         // Targets are the basic building blocks of a package, defining a module or a test suite.