refactor to mautrix 0.17.x; update deps

vendor/maunium.net/go/mautrix/crypto/olm/verification_goolm.go

@@ -0,0 +1,23 @@
+//go:build !nosas && goolm
+
+package olm
+
+import (
+	"maunium.net/go/mautrix/crypto/goolm/sas"
+)
+
+// SAS stores an Olm Short Authentication String (SAS) object.
+type SAS struct {
+	sas.SAS
+}
+
+// NewSAS creates a new SAS object.
+func NewSAS() *SAS {
+	newSAS, err := sas.New()
+	if err != nil {
+		panic(err)
+	}
+	return &SAS{
+		SAS: *newSAS,
+	}
+}