chore: update example & upgrade react-native to v0.69.3.

example/.flowconfig

@@ -11,6 +11,8 @@ node_modules/react-native/Libraries/polyfills/.*
 ; Flow doesn't support platforms
 .*/Libraries/Utilities/LoadingView.js
 
+.*/node_modules/resolve/test/resolver/malformed_package_json/package\.json$
+
 [untyped]
 .*/node_modules/@react-native-community/cli/.*/.*
 
@@ -23,11 +25,10 @@ node_modules/react-native/flow/
 [options]
 emoji=true
 
-esproposal.optional_chaining=enable
-esproposal.nullish_coalescing=enable
-
 exact_by_default=true
 
+format.bracket_spacing=false
+
 module.file_ext=.js
 module.file_ext=.json
 module.file_ext=.ios.js
@@ -51,7 +52,6 @@ nonstrict-import=warn
 deprecated-type=warn
 unsafe-getters-setters=warn
 unnecessary-invariant=warn
-signature-verification-failure=warn
 
 [strict]
 deprecated-type
@@ -63,4 +63,4 @@ untyped-import
 untyped-type-import
 
 [version]
-^0.137.0
+^0.176.3