Allow beta Xcode versions of the form x_beta_y

[bryankconrad]

Describe the Pull Request

Allow beta Xcode versions of the form x_beta_y when using the Xcode recipe to install Xcode. Also updates the minimum_required_os function with more recent Xcode releases and their requirements.

Justification

Attempts to install Xcode with the version "26_beta_3" have been failing because the Version gem does not expect underscores in the versions strings it is given.

[bryankconrad]

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