Bump rxjs from 7.5.1 to 7.5.4 in /app

Bumps [rxjs](https://github.com/reactivex/rxjs) from 7.5.1 to 7.5.4.
- [Release notes](https://github.com/reactivex/rxjs/releases)
- [Changelog](https://github.com/ReactiveX/rxjs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/reactivex/rxjs/compare/7.5.1...7.5.4)

---
updated-dependencies:
- dependency-name: rxjs
  dependency-type: direct:production
  update-type: version-update:semver-patch
...
Signed-off-by: Ndependabot[bot] <support@github.com>

app/package.json

@@ -29,7 +29,7 @@
     "mz": "^2.7.0",
     "native-process-working-directory": "^1.0.2",
     "npm": "6",
-    "rxjs": "^7.5.1",
+    "rxjs": "^7.5.4",
     "source-map-support": "^0.5.20",
     "v8-compile-cache": "^2.3.0",
     "yargs": "^17.3.1"

app/yarn.lock

@@ -3189,10 +3189,10 @@ run-queue@^1.0.0, run-queue@^1.0.3:
   dependencies:
     aproba "^1.1.1"
 
-rxjs@^7.5.1:
-  version "7.5.1"
-  resolved "https://registry.yarnpkg.com/rxjs/-/rxjs-7.5.1.tgz#af73df343cbcab37628197f43ea0c8256f54b157"
-  integrity sha512-KExVEeZWxMZnZhUZtsJcFwz8IvPvgu4G2Z2QyqjZQzUGr32KDYuSxrEYO4w3tFFNbfLozcrKUTvTPi+E9ywJkQ==
+rxjs@^7.5.4:
+  version "7.5.4"
+  resolved "https://registry.yarnpkg.com/rxjs/-/rxjs-7.5.4.tgz#3d6bd407e6b7ce9a123e76b1e770dc5761aa368d"
+  integrity sha512-h5M3Hk78r6wAheJF0a5YahB1yRQKCsZ4MsGdZ5O9ETbVtjPcScGfrMmoOq7EBsCRzd4BDkvDJ7ogP8Sz5tTFiQ==
   dependencies:
     tslib "^2.1.0"