fix: packages/app/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-FOLLOWREDIRECTS-2332181
- https://snyk.io/vuln/SNYK-JS-SHELLJS-2332187

Author: snyk-bot

packages/app/package.json

@@ -95,7 +95,7 @@
     "apollo-link-batch-http": "^1.2.12",
     "apollo-link-context": "^1.0.18",
     "astring": "^1.7.4",
-    "axios": "^0.19.0",
+    "axios": "^0.20.0",
     "babel-code-frame": "^6.26.0",
     "babel-macros": "^2.0.0",
     "babel-plugin-jsx-pragmatic": "^1.0.2",
@@ -225,7 +225,7 @@
     "resize-observer-polyfill": "^1.5.1",
     "sandpack-core": "1.0.0",
     "sha1": "^1.1.1",
-    "shelljs": "^0.7.8",
+    "shelljs": "^0.8.5",
     "store": "^2.0.12",
     "string-replace-loader": "^2.1.1",
     "styled-components": "^5.2.0",