Update module golang.org/x/crypto to v0.39.0

This MR contains the following updates:

Package	Type	Update	Change
golang.org/x/crypto	require	minor	v0.27.0 -> v0.39.0

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go.mod

 module git.autistici.org/ai3/go-common
 
-go 1.21.0
+go 1.23.0
 
 toolchain go1.23.1
 
@@ -28,7 +28,7 @@ require (
 	go.opentelemetry.io/otel/exporters/zipkin v1.9.0
 	go.opentelemetry.io/otel/sdk v1.10.0
 	go.opentelemetry.io/otel/trace v1.10.0
-	golang.org/x/crypto v0.27.0
+	golang.org/x/crypto v0.39.0
 	golang.org/x/sync v0.8.0
 )
 
@@ -54,6 +54,6 @@ require (
 	github.com/prometheus/procfs v0.15.1 // indirect
 	github.com/x448/float16 v0.8.4 // indirect
 	go.opentelemetry.io/otel/metric v0.31.0 // indirect
-	golang.org/x/sys v0.25.0 // indirect
+	golang.org/x/sys v0.33.0 // indirect
 	google.golang.org/protobuf v1.34.2 // indirect
 )