refactor to mautrix 0.17.x; update deps

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

@@ -0,0 +1,20 @@
+//go:build goolm
+
+package olm
+
+import (
+	"maunium.net/go/mautrix/id"
+)
+
+// Signatures is the data structure used to sign JSON objects.
+type Signatures map[id.UserID]map[id.DeviceKeyID]string
+
+// Version returns the version number of the olm library.
+func Version() (major, minor, patch uint8) {
+	return 3, 2, 15
+}
+
+// SetPickleKey sets the global pickle key used when encoding structs with Gob or JSON.
+func SetPickleKey(key []byte) {
+	panic("gob and json encoding is deprecated and not supported with goolm")
+}