chore(deps): bump @koa/cors from 3.1.0 to 5.0.0 in /packages/backend

Bumps [@koa/cors](https://github.com/koajs/cors) from 3.1.0 to 5.0.0.
- [Changelog](https://github.com/koajs/cors/blob/master/History.md)
- [Commits](koajs/cors@3.1.0...5.0.0)

---
updated-dependencies:
- dependency-name: "@koa/cors"
  dependency-type: direct:production
...

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

Author: dependabot[bot]

packages/backend/package.json

@@ -20,7 +20,7 @@
 		"@bull-board/koa": "4.2.2",
 		"@discordapp/twemoji": "14.0.2",
 		"@elastic/elasticsearch": "7.11.0",
-		"@koa/cors": "3.1.0",
+		"@koa/cors": "5.0.0",
 		"@koa/multer": "3.0.0",
 		"@koa/router": "9.0.1",
 		"@peertube/http-signature": "1.7.0",

packages/backend/yarn.lock

@@ -158,10 +158,10 @@
     "@jridgewell/resolve-uri" "^3.0.3"
     "@jridgewell/sourcemap-codec" "^1.4.10"
 
-"@koa/cors@3.1.0":
-  version "3.1.0"
-  resolved "https://registry.yarnpkg.com/@koa/cors/-/cors-3.1.0.tgz#618bb073438cfdbd3ebd0e648a76e33b84f3a3b2"
-  integrity sha512-7ulRC1da/rBa6kj6P4g2aJfnET3z8Uf3SWu60cjbtxTA5g8lxRdX/Bd2P92EagGwwAhANeNw8T8if99rJliR6Q==
+"@koa/cors@5.0.0":
+  version "5.0.0"
+  resolved "https://registry.yarnpkg.com/@koa/cors/-/cors-5.0.0.tgz#0029b5f057fa0d0ae0e37dd2c89ece315a0daffd"
+  integrity sha512-x/iUDjcS90W69PryLDIMgFyV21YLTnG9zOpPXS7Bkt2b8AsY3zZsIpOLBkYr9fBcF3HbkKaER5hOBZLfpLgYNw==
   dependencies:
     vary "^1.1.2"