getmail: Use newer getmail6 over getmail package

[romanofski]

The getmail package will soon be removed from nixpkgs. The
nixos-unstable channel already has it removed and using the service
will result in:

error: getmail has been removed from nixpkgs, migrate to getmail6

Upgrade to the getmail6 package which is already available and backwards
compatible.

[teto]

could you amend and repush to retrigger the ci ? getmail was removed in https://github.com/NixOS/nixpkgs/pull/154697/files#diff-44c521cada1a7bc163a0f625ac1bf8326cb83e5b302536cdc0f6874163186670

[rycee]

@romanofski When opening the PR did you get a template message with a checklist of things to do? If you did and intentionally removed it then please don't do that. It is there to help us review PRs and to avoid inconsistencies in the project. It is fine to disagree with the project contribution guidelines but please raise your concerns publically instead of surreptitiously removing the PR checklist.

[romanofski]

@romanofski When opening the PR did you get a template message with a checklist of things to do? If you did and intentionally removed it then please don't do that. It is there to help us review PRs and to avoid inconsistencies in the project. It is fine to disagree with the project contribution guidelines but please raise your concerns publically instead of surreptitiously removing the PR checklist.

@rycee I'm very sorry. I did not mean to disagree with any of the guidelines. I presume I removed the checklist since I thought it was a one line change. Again I'm very sorry if it promoted bad behaviour or disagreement. I will not remove the template when filing a new PR.