Scimmy: Remove the cast to express.Router

This issue is now solved:
scimmyjs/scimmy-routers#24

app/server/lib/scim/v2/ScimV2Api.ts

@@ -36,15 +36,16 @@ const buildScimRouterv2 = (dbManager: HomeDBManager, installAdmin: InstallAdmin)
 
       return String(mreq.userId); // SCIMMYRouters requires the userId to be a string.
     },
-    context: async (mreq: RequestWithLogin): Promise<RequestContext> => {
+    context: async (req: express.Request): Promise<RequestContext> => {
+      const mreq = req as RequestWithLogin;
       const isAdmin = await installAdmin.isAdminReq(mreq);
       const isScimUser = Boolean(
         process.env.GRIST_SCIM_EMAIL && mreq.user?.loginEmail === process.env.GRIST_SCIM_EMAIL
       );
       const path = mreq.path;
       return { isAdmin, isScimUser, path };
     }
-  }) as express.Router; // Have to cast it into express.Router. See https://github.com/scimmyjs/scimmy-routers/issues/24
+  });
 
   return v2.use('/', scimmyRouter);
 };