Bump classnames from 2.2.6 to 2.3.1 in /idp

Bumps [classnames](https://github.com/JedWatson/classnames) from 2.2.6 to 2.3.1.
- [Release notes](https://github.com/JedWatson/classnames/releases)
- [Changelog](https://github.com/JedWatson/classnames/blob/master/HISTORY.md)
- [Commits](https://github.com/JedWatson/classnames/compare/v2.2.6...v2.3.1)

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

idp/package.json

@@ -18,7 +18,7 @@
     "babel-preset-react-app": "^10.0.0",
     "camelcase": "^6.2.0",
     "case-sensitive-paths-webpack-plugin": "2.4.0",
-    "classnames": "^2.2.6",
+    "classnames": "^2.3.1",
     "css-loader": "5.2.6",
     "dotenv": "8.2.0",
     "dotenv-expand": "5.1.0",

idp/yarn.lock

@@ -4053,10 +4053,10 @@ class-utils@^0.3.5:
     isobject "^3.0.0"
     static-extend "^0.1.1"
 
-classnames@^2.2.6:
-  version "2.2.6"
-  resolved "https://registry.yarnpkg.com/classnames/-/classnames-2.2.6.tgz#43935bffdd291f326dad0a205309b38d00f650ce"
-  integrity sha512-JR/iSQOSt+LQIWwrwEzJ9uk0xfN3mTVYMwt1Ir5mUcSN6pU+V4zQFFaJsclJbPuAUQH+yfWef6tm7l1quW3C8Q==
+classnames@^2.3.1:
+  version "2.3.1"
+  resolved "https://registry.yarnpkg.com/classnames/-/classnames-2.3.1.tgz#dfcfa3891e306ec1dad105d0e88f4417b8535e8e"
+  integrity sha512-OlQdbZ7gLfGarSqxesMesDa5uz7KFbID8Kpq/SxIoNGDqY8lSYs0D+hhtBXhcdB3rcbXArFr7vlHheLk1voeNA==
 
 cldr@^5.2.0:
   version "5.8.0"