Fix activation endpoint HTTP method

src/models/calendar/users/users.router.ts

@@ -60,8 +60,8 @@ usersRouter.post('/register', async (req: Request, res: Response) => {
 	}
 });
 
-// POST /users/activate
-usersRouter.post('/activate', async (req: Request, res: Response) => {
+// GET /users/activate
+usersRouter.get('/activate', async (req: Request, res: Response) => {
 	try {
 		const userId: number = parseInt(req.query.id as string ?? '-1', 10);
 		const token: string = req.query.token as string ?? '';