X-Pantheon-Session should be sent in a header not a cookie.

[kporras07]

Hi Lando folks 👋

At Pantheon we recently made a API change for terminus in which we removed the old way we had (Terminux 0.x) for requests to authenticate to the API using cookies. After we moved 100% of requests to Terminus API we started getting support tickets that Lando is not working for clients.

After taking a look to the code, we found that Lando was using cookies but it should really be using the actual headers.

This PR is UNTESTED, hopefully a guide for you to understand what should happen here.

Thanks!

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[reynoldsalec]

My manual testing looks good and the relevant test suites are giving greenlights. I'm going to cut a release with this in it so we can get people back up-and-running, thanks @kporras07 for addressing it so quickly, you're a FOSS hero!

[ItsMarioSouza]

@reynoldsalec - will there be a new release for the current stable version of Lando, v3.20.*? If not, is there a way to manually update or apply this update? Thanks in advance, sorry for the ignorance.