Bump koa-generic-session from 2.0.1 to 2.0.4

Bumps [koa-generic-session](https://github.com/koajs/generic-session) from 2.0.1 to 2.0.4.
- [Release notes](https://github.com/koajs/generic-session/releases)
- [Changelog](https://github.com/koajs/generic-session/blob/master/History.md)
- [Commits](https://github.com/koajs/generic-session/compare/2.0.1...v2.0.4)

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

package.json

@@ -60,7 +60,7 @@
     "koa-csrf": "^3.0.8",
     "koa-error": "^3.2.0",
     "koa-favicon": "~2.0.1",
-    "koa-generic-session": "^2.0.1",
+    "koa-generic-session": "^2.0.4",
     "koa-helmet": "^5.2.0",
     "koa-logger": "~3.2.1",
     "koa-redis": "^4.0.1",