Update dependency go to v1.24.4

This MR contains the following updates:

Package	Type	Update	Change
go (source)	toolchain	minor	1.23.1 -> 1.24.4

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go.mod

@@ -2,7 +2,7 @@ module git.autistici.org/ai3/tools/reports-collector
 
 go 1.21
 
-toolchain go1.23.1
+toolchain go1.24.0
 
 require (
 	github.com/chrj/smtpd v0.3.1