Fix Content-Length for mail attachment and passport download

What does this MR do?

It fixes the wrong Content-Length header for mailbox attachments and passports, what lead to failing download

How confident are you it won't break things if deployed?

Sure

Links to related issues

https://yunity.slack.com/archives/CDFSR3Y4U/p1681323486175869

How to test

Already tested on beta and production

Checklist

• added a test, or explain why one is not needed/possible...
• no unrelated changes
• asked someone for a code review
• set a "for:" label to indicate who will be affected by this change
• added to the next milestone (see https://gitlab.com/foodsharing-dev/foodsharing/-/milestones, unless it has a "for:Dev" label)
• added an entry to CHANGELOG.md

changed milestone to %Release Jackfrucht (September 2023)

added forFS Community label

assigned to @stcz

added 1 commit

• a48d18af - Add CHANGELOG.md

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marked the checklist item added an entry to CHANGELOG.md as completed

changed the description

added 1 commit

• ed7fc7bc - Add wrong header in PassportGeneratorControl.php

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added 1 commit

• e9829b3a - Update CHANGELOG.md

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changed title from Fix Mailbox attachment download to Fix Content-Length for mail attachment and passport download

changed the description

approved this merge request

approved this merge request

added 6 commits

• e9829b3a...edac9dab - 2 commits from branch master
• 4a715d27 - Fix Mailbox attachment download
• cd51cfe4 - Add CHANGELOG.md
• fecf428c - Add wrong header in PassportGeneratorControl.php
• e2b5923b - Update CHANGELOG.md

Compare with previous version

enabled an automatic merge when the pipeline for e2b5923b succeeds

merged