Raise minimum version in podspec

Author: simolus3

powersync-sqlite-core.podspec

@@ -15,5 +15,5 @@ PowerSync extension for SQLite.
 
   s.ios.deployment_target = '11.0'
   s.osx.deployment_target = '10.13'
-  s.watchos.deployment_target = '7.0'
+  s.watchos.deployment_target = '9.0'
 end