Bump ws from 7.2.0 to 7.4.6

Bumps [ws](https://github.com/websockets/ws) from 7.2.0 to 7.4.6.
- [Release notes](https://github.com/websockets/ws/releases)
- [Commits](websockets/ws@7.2.0...7.4.6)

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

package.json

@@ -58,7 +58,7 @@
     "elliptic": "6.5.1",
     "koa": "2.11.0",
     "uuid": "3.3.3",
-    "ws": "7.2.0"
+    "ws": "7.4.6"
   },
   "devDependencies": {
     "@testdeck/mocha": "^0.0.6",

yarn.lock

@@ -368,11 +368,6 @@ assertion-error@^1.1.0:
   resolved "https://registry.yarnpkg.com/assertion-error/-/assertion-error-1.1.0.tgz#e60b6b0e8f301bd97e5375215bda406c85118c0b"
   integrity sha512-jgsaNduz+ndvGyFt3uSuWqvy4lCnIJiovtouQN5JZHOKCS2QuhEdbcQHFhVksz2N2U9hXJo8odG7ETyWlEeuDw==
 
-async-limiter@^1.0.0:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/async-limiter/-/async-limiter-1.0.1.tgz#dd379e94f0db8310b08291f9d64c3209766617fd"
-  integrity sha512-csOlWGAcRFJaI6m+F2WKdnMKr4HhdhFVBk0H/QbJFMCr+uO2kwohwXQPxw/9OCxp05r5ghVBFSyioixx3gfkNQ==
-
 balanced-match@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/balanced-match/-/balanced-match-1.0.0.tgz#89b4d199ab2bee49de164ea02b89ce462d71b767"
@@ -2074,12 +2069,10 @@ write-file-atomic@^2.4.2:
     imurmurhash "^0.1.4"
     signal-exit "^3.0.2"
 
-[email protected]:
-  version "7.2.0"
-  resolved "https://registry.yarnpkg.com/ws/-/ws-7.2.0.tgz#422eda8c02a4b5dba7744ba66eebbd84bcef0ec7"
-  integrity sha512-+SqNqFbwTm/0DC18KYzIsMTnEWpLwJsiasW/O17la4iDRRIO9uaHbvKiAS3AHgTiuuWerK/brj4O6MYZkei9xg==
-  dependencies:
-    async-limiter "^1.0.0"
+[email protected]:
+  version "7.4.6"
+  resolved "https://registry.yarnpkg.com/ws/-/ws-7.4.6.tgz#5654ca8ecdeee47c33a9a4bf6d28e2be2980377c"
+  integrity sha512-YmhHDO4MzaDLB+M9ym/mDA5z0naX8j7SIlT8f8z+I0VtzsRbekxEutHSme7NPS2qE8StCYQNUnfWdXta/Yu85A==
 
 y18n@^4.0.0:
   version "4.0.0"