2.1.0 "Dirs"

This release contains a fix for a small bug in the cookie cache implementation, and updates some dependencies:

• The directory containing the cookie cache for OpenID authentication is crated ahead of time if it does not already exist. Fixes issues with storing and loading cookies for the first time.
• Update the dirs crate to version 5.
• Update the env_logger crate to version 0.10.
• Bump MSRV to 1.67.0 (due to transitive dependencies).

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Thanks to @pendulum-project, @elementary, @tweedegolf, @Conan-Kudo, @sdroege, @quot, and a mystery sponsor for supporting my work.