Bump electron from 7.1.1 to 7.1.8 in /app (#210)

Bumps [electron](https://github.com/electron/electron) from 7.1.1 to 7.1.8.
- [Release notes](https://github.com/electron/electron/releases)
- [Commits](https://github.com/electron/electron/compare/v7.1.1...v7.1.8)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

app/package.json

@@ -68,7 +68,7 @@
   },
   "devDependencies": {
     "chokidar": "^3.3.0",
-    "electron": "^7.1.1",
+    "electron": "^7.1.8",
     "electron-builder": "^22.1.0",
     "electron-rebuild": "^1.8.8",
     "readline-sync": "1.4.10"

app/yarn.lock

@@ -1031,10 +1031,10 @@ electron-rebuild@^1.8.8:
     spawn-rx "^3.0.0"
     yargs "^13.2.4"
 
-electron@^7.1.1:
-  version "7.1.1"
-  resolved "https://registry.yarnpkg.com/electron/-/electron-7.1.1.tgz#98be17d850e64689a09ab6dd1e437b36307f2fcf"
-  integrity sha512-NJPv4SuMJlRUtXBd/Ey9XKSLOZ4+hxsOrHHPXwrBQNNdeZesoSrTMgPymee/FwMRtrSt0Pz8NccEZUu/pxmbhQ==
+electron@^7.1.8:
+  version "7.1.8"
+  resolved "https://registry.yarnpkg.com/electron/-/electron-7.1.8.tgz#7cd50fdf42c55c9de86ab126e983d23fd89d5d99"
+  integrity sha512-1cWT7toVcSTKu3HdnhDQpbTmI5QCSKtIbg+wHUkSZCdAqjPcuH+dpm+j21g38LbE2DoIzdryaN0RTZOqTPebMA==
   dependencies:
     "@electron/get" "^1.0.1"
     "@types/node" "^12.0.12"