Convert fail2ban.png to greyscale

This particular image stands out because it is in color while all other images are greyscale due to fact that PlantUML bitmaps are also grey.
cloudogu · Nov 1, 2023 · 8512cd6 · 8512cd6
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commit 8512cd6
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diff --git a/tools/fail2ban.png b/tools/fail2ban.png