Decide when we upgrade to Stretch 9.4

Stretch 9.4 should be released at some point in March, possibly very shortly the Tails 3.6 freeze, possibly after the 3.6 final release. Let’s see if we can/want to have it in Tails 3.6 (major), 3.7 (bugfix), 3.8 (bugfix) or 3.9 (major).

Parent Task: #15341 (closed)

Related issues

Blocks #13245 (closed)

Original created by @intrigeri on 15304 (Redmine)

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