flow: Upgrade to v0.128.

It looks like we can get away with yet another of these Flow
upgrades, before the main RN v0.64 upgrade commit! See a few others,
earlier in this series.

What we want from this version is facebook/flow@ba78ab9bf, which
adds `$FlowIgnore` to the standard suppression syntax.

.flowconfig

@@ -123,4 +123,4 @@ module.file_ext=.json
 module.file_ext=.ios.js
 
 [version]
-^0.127.0
+^0.128.0

package.json

@@ -116,7 +116,7 @@
     "eslint-plugin-prettier": "^3.2.0",
     "eslint-plugin-react": "^7.21.5",
     "eslint-plugin-react-hooks": "^4.2.0",
-    "flow-bin": "^0.127.0",
+    "flow-bin": "^0.128.0",
     "flow-coverage-report": "^0.6.0",
     "flow-typed": "^2.4.0",
     "immutable-devtools": "^0.1.5",

yarn.lock

@@ -5621,10 +5621,10 @@ flow-annotation-check@1.8.1:
     glob "7.1.1"
     load-pkg "^3.0.1"
 
-flow-bin@^0.127.0:
-  version "0.127.0"
-  resolved "https://registry.yarnpkg.com/flow-bin/-/flow-bin-0.127.0.tgz#0614cff4c1b783beef1feeb7108d536e09d77632"
-  integrity sha512-ywvCCdV4NJWzrqjFrMU5tAiVGyBiXjsJQ1+/kj8thXyX15V17x8BFvNwoAH97NrUU8T1HzmFBjLzWc0l2319qg==
+flow-bin@^0.128.0:
+  version "0.128.0"
+  resolved "https://registry.yarnpkg.com/flow-bin/-/flow-bin-0.128.0.tgz#fd1232a64dc46874d8d499f16a1934b964f4c2ae"
+  integrity sha512-EnmMSOCrkx8F0r1+T1d1HODQ+ddy5yRfkT3CvwmK05IWZyXQy27OVdNwdXUWRqc0iMW75T4QkoXaVBYrMqfk+A==
 
 flow-coverage-report@^0.6.0:
   version "0.6.2"