Upgrade Error from 9.5 to 10.0.

I had the same problem. visiting update.php and did database update solved this issue.

Alas, drush updb throws an error:
[preflight] Mapping values are not allowed in multi-line blocks at line 2 (near "<?php").

I'm getting same issue while upgrading the drupal 9.5.11 to 10.0.0 via composer:
Problem 1
- Root composer.json requires drupal/commerce_cart_api ^1.6.0 -> satisfiable by drupal/commerce_cart_api[1.6.0, 1.x-dev].
- drupal/commerce_cart_api[1.6.0, ..., 1.x-dev] require drupal/core ^8.8 || ^9 -> found drupal/core[8.8.0-alpha1, ..., 8.9.x-dev, 9.0.0-alpha1, ..., 9.5.x-dev] but it conflicts with your root composer.json require (10.1.5).
Problem 2
- Root composer.json requires drupal/commerce_n_genius ^1.0@alpha -> satisfiable by drupal/commerce_n_genius[1.0.0-alpha1].
- drupal/commerce_n_genius 1.0.0-alpha1 requires drupal/core ^8 || ^9 -> found drupal/core[8.0.0-beta6, ..., 8.9.x-dev, 9.0.0-alpha1, ..., 9.5.x-dev] but it conflicts with your root composer.json require (10.1.5).
Problem 3
- Root composer.json requires drupal/core-recommended 9.5.11 -> satisfiable by drupal/core-recommended[9.5.11].
- drupal/core-recommended 9.5.11 requires drupal/core 9.5.11 -> found drupal/core[9.5.11] but it conflicts with your root composer.json require (10.1.5).
Problem 4
- Root composer.json requires drupal/miniorange_saml ^2.28 -> satisfiable by drupal/miniorange_saml[2.28.0].
- drupal/miniorange_saml 2.28.0 requires drupal/core ^8 || ^9 -> found drupal/core[8.0.0-beta6, ..., 8.9.x-dev, 9.0.0-alpha1, ..., 9.5.x-dev] but it conflicts with your root composer.json require (10.1.5).
Problem 5
- Root composer.json requires drupal/simple_sitemap ^3.11.0 -> satisfiable by drupal/simple_sitemap[3.11.0, 3.x-dev].
- drupal/simple_sitemap[3.11.0, ..., 3.x-dev] require drupal/core ^8 || ^9 -> found drupal/core[8.0.0-beta6, ..., 8.9.x-dev, 9.0.0-alpha1, ..., 9.5.x-dev] but it conflicts with your root composer.json require (10.1.5).
Problem 6
- drupal/domain 1.0.0-alpha13 requires drupal/core ^8 -> found drupal/core[8.0.0-beta6, ..., 8.9.x-dev] but it conflicts with your root composer.json require (10.1.5).
- drupal/domain[1.0.0-alpha14, ..., 1.0.0-alpha16] require drupal/core ^8.5 -> found drupal/core[8.5.0-alpha1, ..., 8.9.x-dev] but it conflicts with your root composer.json require (10.1.5).
- drupal/domain[1.0.0-beta1, ..., 1.x-dev] require drupal/core ^8 || ^9 -> found drupal/core[8.0.0-beta6, ..., 8.9.x-dev, 9.0.0-alpha1, ..., 9.5.x-dev] but it conflicts with your root composer.json require (10.1.5).
- Root composer.json requires drupal/domain ^1.0.0-alpha13 -> satisfiable by drupal/domain[1.0.0-alpha13, ..., 1.x-dev].

How Can I do this any one kindly let me know.

Most of that output explains itself. For example:

drupal/miniorange_saml 2.28.0 requires drupal/core ^8 || ^9 -> found drupal/core[8.0.0-beta6, ..., 8.9.x-dev, 9.0.0-alpha1, ..., 9.5.x-dev] but it conflicts with your root composer.json require (10.1.5).