Bump supertest from 6.0.1 to 6.1.3 in /backend

Bumps [supertest](https://github.com/visionmedia/supertest) from 6.0.1 to 6.1.3.
- [Release notes](https://github.com/visionmedia/supertest/releases)
- [Commits](forwardemail/supertest@v6.0.1...v6.1.3)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

backend/package.json

@@ -39,6 +39,6 @@
   "devDependencies": {
     "jest": "^26.6.3",
     "nodemon": "^2.0.6",
-    "supertest": "^6.0.1"
+    "supertest": "^6.1.3"
   }
 }

backend/yarn.lock

@@ -3921,7 +3921,7 @@ merge-stream@^2.0.0:
   resolved "https://registry.yarnpkg.com/merge-stream/-/merge-stream-2.0.0.tgz#52823629a14dd00c9770fb6ad47dc6310f2c1f60"
   integrity sha512-abv/qOcuPfk3URPfDzmZU1LKmuw8kT+0nIHvKrKgFrwifol/doWcdA4ZqsWQ8ENrFKkd67Mfpo/LovbIUsbt3w==
 
-methods@1.1.2, methods@^1.1.2, methods@~1.1.2:
+methods@^1.1.2, methods@~1.1.2:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/methods/-/methods-1.1.2.tgz#5529a4d67654134edcc5266656835b0f851afcee"
   integrity sha1-VSmk1nZUE07cxSZmVoNbD4Ua/O4=
@@ -5298,7 +5298,7 @@ subscriptions-transport-ws@^0.9.11, subscriptions-transport-ws@^0.9.16:
     symbol-observable "^1.0.4"
     ws "^5.2.0"
 
-[email protected]:
+superagent@^6.1.0:
   version "6.1.0"
   resolved "https://registry.yarnpkg.com/superagent/-/superagent-6.1.0.tgz#09f08807bc41108ef164cfb4be293cebd480f4a6"
   integrity sha512-OUDHEssirmplo3F+1HWKUrUjvnQuA+nZI6i/JJBdXb5eq9IyEQwPyPpqND+SSsxf6TygpBEkUjISVRN4/VOpeg==
@@ -5315,13 +5315,13 @@ [email protected]:
     readable-stream "^3.6.0"
     semver "^7.3.2"
 
-supertest@^6.0.1:
-  version "6.0.1"
-  resolved "https://registry.yarnpkg.com/supertest/-/supertest-6.0.1.tgz#f6b54370de85c45d6557192c8d7df604ca2c9e18"
-  integrity sha512-8yDNdm+bbAN/jeDdXsRipbq9qMpVF7wRsbwLgsANHqdjPsCoecmlTuqEcLQMGpmojFBhxayZ0ckXmLXYq7e+0g==
+supertest@^6.1.3:
+  version "6.1.3"
+  resolved "https://registry.yarnpkg.com/supertest/-/supertest-6.1.3.tgz#3f49ea964514c206c334073e8dc4e70519c7403f"
+  integrity sha512-v2NVRyP73XDewKb65adz+yug1XMtmvij63qIWHZzSX8tp6wiq6xBLUy4SUAd2NII6wIipOmHT/FD9eicpJwdgQ==
   dependencies:
-    methods "1.1.2"
-    superagent "6.1.0"
+    methods "^1.1.2"
+    superagent "^6.1.0"
 
 supports-color@^5.3.0, supports-color@^5.5.0:
   version "5.5.0"