Add PHP 8.1 Support

[jorgecar]

If I want to install I get:

Your lock file does not contain a compatible set of packages. Please run composer update.

Problem 1

• phpro/soap-client is locked to version v1.7.2 and an update of this package was not requested.
• phpro/soap-client v1.7.2 requires php ^7.4 || <8.1 -> your php version (8.1.1) does not satisfy that requirement.

Problem 2

• phpro/soap-client v1.7.2 requires php ^7.4 || <8.1 -> your php version (8.1.1) does not satisfy that requirement.
• codedredd/laravel-soap v2.0.0-rc.1 requires phpro/soap-client ^1.4 -> satisfiable by phpro/soap-client[v1.7.2].
• codedredd/laravel-soap is locked to version v2.0.0-rc.1 and an update of this package was not requested.

At least the phpro/soap-client package should be upgraded to Version 2.1.0

[jorgecar]

Thank you so much!