Upgrade to tor 0.4.3.x

See merge request !46

This reverts commit 61fd61f4.

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Document why some major Tails features are not packaged for Debian

Closes #6944

See merge request !35

Update sysadmins OpenPGP key due to expiry

See merge request !45

Buster 10.4 + Linux 5.6

See merge request !44

Fix all branches FTBFS by bumping thunderbird apparmor patch

See merge request !41

GitLab: document gitlab-config repo and what it's useful for

Closes #17753

See merge request !40

Merge remote-tracking branch 'origin/bugfix/17769-bump-thunderbird-apparmor-patch' into feature/17620-buster-10.4+force-all-tests

I want the target branch to build, despite the #17769 FTBFS.

refs #17620

I'm under the impression that nobody felt like doing that recently,
so I won't bother porting this to GitLab.

This does not seem to be the correct issue ID. I suspect a copy'n'paste
error.

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