minor symfony#12628 Replace images by more recent one (noniagriconomie)

This PR was submitted for the master branch but it was merged into the 4.3 branch instead (closes symfony#12628).

Discussion
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Replace images by more recent one

Just more recent images (I was testing the 4.3 branch)
I will do the same when 4.4 will be released

Commits
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26763ac Replace images by more recent one

Author: OskarStark