Update module go to 1.20 - autoclosed

This MR contains the following updates:

Package	Type	Update	Change
go (source)	golang	minor	1.16 -> 1.20

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go.mod

 module git.autistici.org/ai3/tools/smtpd-pipe
 
-go 1.16
+go 1.19
 
 require github.com/chrj/smtpd v0.3.0