tests: Tag gsocketclient-slow test as ‘flaky’

Merged Philip Withnall requested to merge pwithnall/glib:1653-gsocketclient-slow-flaky into master

It needs investigating and fixing properly, but let’s not let it disrupt the CI in the meantime.

Follow-up in #1653 (closed).

Signed-off-by: Philip Withnall withnall@endlessm.com

Helps #1653 (closed)

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