Update Swift dependency [1.6.0 -> 1.7.0-rc2]

Author: greenrobot-team

flutter_libs/ios/objectbox_flutter_libs.podspec

@@ -14,7 +14,7 @@ Pod::Spec.new do |s|
   s.source_files     = 'Classes/**/*'
 
   s.dependency 'Flutter'
-  s.dependency 'ObjectBox', '1.6.0'
+  s.dependency 'ObjectBox', '1.7.0-rc2'
 
   # Flutter.framework does not contain a i386 or arm64. Only x86_64 simulators are supported.
   s.pod_target_xcconfig = { 'DEFINES_MODULE' => 'YES', 'VALID_ARCHS[sdk=iphonesimulator*]' => 'x86_64' }

flutter_libs/macos/objectbox_flutter_libs.podspec

@@ -14,7 +14,7 @@ Pod::Spec.new do |s|
   s.source_files     = 'Classes/**/*'
 
   s.dependency 'FlutterMacOS'
-  s.dependency 'ObjectBox', '1.6.0'
+  s.dependency 'ObjectBox', '1.7.0-rc2'
 
   s.pod_target_xcconfig = { 'DEFINES_MODULE' => 'YES' }
   s.swift_version = '5.3'