Bump async from 3.2.0 to 3.2.2 in /backend

Bumps [async](https://github.com/caolan/async) from 3.2.0 to 3.2.2.
- [Release notes](https://github.com/caolan/async/releases)
- [Changelog](https://github.com/caolan/async/blob/master/CHANGELOG.md)
- [Commits](https://github.com/caolan/async/compare/v3.2.0...v3.2.2)

---
updated-dependencies:
- dependency-name: async
  dependency-type: direct:production
...

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

backend/package-lock.json

@@ -325,9 +325,9 @@
       "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU="
     },
     "async": {
-      "version": "3.2.0",
-      "resolved": "https://registry.npmjs.org/async/-/async-3.2.0.tgz",
-      "integrity": "sha512-TR2mEZFVOj2pLStYxLht7TyfuRzaydfpxr3k9RpHIzMgw7A64dzsdqCxH1WJyQdoe8T10nDXd9wnEigmiuHIZw=="
+      "version": "3.2.2",
+      "resolved": "https://registry.npmjs.org/async/-/async-3.2.2.tgz",
+      "integrity": "sha512-H0E+qZaDEfx/FY4t7iLRv1W2fFI6+pyCeTw1uN20AQPiwqwM6ojPxHxdLv4z8hi2DtnW9BOckSspLucW7pIE5g=="
     },
     "async-mutex": {
       "version": "0.3.1",

backend/package.json

@@ -31,7 +31,7 @@
   "homepage": "",
   "dependencies": {
     "archiver": "^3.1.1",
-    "async": "^3.1.0",
+    "async": "^3.2.2",
     "async-mutex": "^0.3.1",
     "axios": "^0.21.2",
     "bcryptjs": "^2.4.0",