Upgrade flow to v109 (#1395)

We need one tiny change in test code, where Flow (correctly) detects an
error. I've added an error suppression comment because it is truly a
Flow error, but is appropriate as we are testing an error condition.

Test plan: `yarn test`

package.json

@@ -62,7 +62,7 @@
     "eslint-plugin-jsx-a11y": "6.2.3",
     "eslint-plugin-react": "7.14.3",
     "file-loader": "^4.0.0",
-    "flow-bin": "^0.105.0",
+    "flow-bin": "^0.109.0",
     "jest": "^24.8.0",
     "jest-fetch-mock": "^2.1.2",
     "prettier": "1.18.2",

src/core/version.test.js

@@ -54,6 +54,7 @@ describe("core/version", () => {
     });
     it("fails given a JSON object missing a property", () => {
       const gitState = version().gitState;
+      // $ExpectFlowError
       delete gitState.dirty;
       expect(() => parseGitState(JSON.stringify(gitState))).toThrow(
         "gitState: bad shape: {"

yarn.lock

@@ -3746,10 +3746,10 @@ flatted@^2.0.0:
   resolved "https://registry.yarnpkg.com/flatted/-/flatted-2.0.1.tgz#69e57caa8f0eacbc281d2e2cb458d46fdb449e08"
   integrity sha512-a1hQMktqW9Nmqr5aktAux3JMNqaucxGcjtjWnZLHX7yyPCmlSV3M54nGYbqT8K+0GhF3NBgmJCc3ma+WOgX8Jg==
 
-flow-bin@^0.105.0:
-  version "0.105.2"
-  resolved "https://registry.yarnpkg.com/flow-bin/-/flow-bin-0.105.2.tgz#9d03d5ae3e1d011e311f309cb8786b3b3695fec2"
-  integrity sha512-VCHt0SCjFPviv/Ze/W7AgkcE0uH4TocypSFA8wR3ZH1P7BSjny4l3uhHyOjzU3Qo1i0jO4NyaU6q3Y5IaQ6xng==
+flow-bin@^0.109.0:
+  version "0.109.0"
+  resolved "https://registry.yarnpkg.com/flow-bin/-/flow-bin-0.109.0.tgz#dcdcb7402dd85b58200392d8716ccf14e5a8c24c"
+  integrity sha512-tpcMTpAGIRivYhFV3KJq+zHI2HzcXo8MoGe9pXS4G/UZuey2Faq/e8/gdph2WF0erRlML5hmwfwiq7v9c25c7w==
 
 flush-write-stream@^1.0.0:
   version "1.1.1"