fix: upgrade express-rate-limit from 5.3.0 to 5.4.0

Snyk has created this PR to upgrade express-rate-limit from 5.3.0 to 5.4.0.

See this package in npm:
https://www.npmjs.com/package/express-rate-limit

See this project in Snyk:
https://app.snyk.io/org/johnmclear/project/d9a12bfb-7ccd-443f-9e22-f30d339cc8c5?utm_source=github&utm_medium=referral&page=upgrade-pr

src/package-lock.json

@@ -2328,9 +2328,9 @@
       }
     },
     "express-rate-limit": {
-      "version": "5.3.0",
-      "resolved": "https://registry.npmjs.org/express-rate-limit/-/express-rate-limit-5.3.0.tgz",
-      "integrity": "sha512-qJhfEgCnmteSeZAeuOKQ2WEIFTX5ajrzE0xS6gCOBCoRQcU+xEzQmgYQQTpzCcqUAAzTEtu4YEih4pnLfvNtew=="
+      "version": "5.4.0",
+      "resolved": "https://registry.npmjs.org/express-rate-limit/-/express-rate-limit-5.4.0.tgz",
+      "integrity": "sha512-sT+rk1wvj06+0MpEiij7y3kGdB4hoMyQ+a5zcESUpDMLhbLXoYIQI6JfsvLBz1wOhmfF//ALG/Q59FKMI0x2Eg=="
     },
     "express-session": {
       "version": "1.17.2",

src/package.json

@@ -39,7 +39,7 @@
     "etherpad-require-kernel": "^1.0.15",
     "etherpad-yajsml": "0.0.12",
     "express": "4.17.1",
-    "express-rate-limit": "5.3.0",
+    "express-rate-limit": "5.4.0",
     "express-session": "1.17.2",
     "fast-deep-equal": "^3.1.3",
     "find-root": "1.1.0",