graphics/ImageMagick6: Return to pool

[diizzy]

Summary

Return to pool due to multiple maintainer timeouts

[diizzy]

My reasoning here is that ImageMagick is a rather "high profile" port and instead of waiting for someone to submit a PR, wait for another timeout and ask for adoption I think it's better to proactively announce that maintainership is available.
This port is also outdated (about 6 months)

kwm, please don't take this the wrong way and I understand if you're busy/unavailable due to the current situation. We appreciate the time you've spent on maintaining ImageMagick :-)

Reference: https://www.freshports.org/graphics/ImageMagick6/

[tcberner]

Please give it to desktop@

[diizzy]

Ok, will do

[diizzy]

Merge with D32626