Seconding this: Perl::Critic is simply wrong here. The primary risk of two-argument open is the possibility of a "strange" filename improperly triggering the magic (How about a "file" named 'rm -rf / |'?), but in this case the filename is a literal constant and that is not possible.
This is a bug in Perl::Critic — your particular use of the two-argument syntax is fine.
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