feat(services): add update function in mysql service

This commit adds an `update` function to the `mysql.service.ts`. This new function will update a rent record in the database. It takes a database handler object and a rent object containing the updated data, and returns a Promise that resolves to the status result of the update operation. The function will throw an error if an issue occurs during the update operation.

Issue: #23
Signed-off-by: Mathis <yidhra@tuta.io>

src/services/mysql.service.ts

@@ -1135,6 +1135,7 @@ const MySqlService = {
 			});
 		},
 
+		//ToTest
 		/**
 		 * Retrieves all assigned vehicles from the database.
 		 *
@@ -1156,6 +1157,16 @@ const MySqlService = {
 				}
 			});
 		},
+
+		//ToTest
+		/**
+		 * Updates a rent record in the database.
+		 *
+		 * @param {MysqlHandler} handler - The database handler object.
+		 * @param {IDbRent} data - The rent object containing the updated data.
+		 * @returns {Promise<IDbStatusResult>} - A promise that resolves to the status result of the update operation.
+		 * @throws {Error} - If an error occurs during the update operation.
+		 */
 		update(handler: MysqlHandler, data: IDbRent): Promise<IDbStatusResult> {
 			return new Promise((resolve, reject) => {
 				if (!data.id) return reject("Id is undefined");