Downgrade the MySQL driver

This is because we need to update the handling of strings. The new MySQL
driver NO LONGER returns RawBytes, but NullString, and the code needs to
be updated to take this into account before we bump the version.

go.mod

@@ -4,7 +4,7 @@ go 1.20
 
 require (
 	github.com/eclipse/paho.mqtt.golang v1.4.3
-	github.com/go-sql-driver/mysql v1.8.1
+	github.com/go-sql-driver/mysql v1.6.0
 	github.com/gogo/protobuf v1.3.2
 	github.com/lib/pq v1.10.9
 	github.com/segmentio/kafka-go v0.4.47
@@ -20,7 +20,6 @@ require (
 )
 
 require (
-	filippo.io/edwards25519 v1.1.0 // indirect
 	github.com/mitchellh/mapstructure v1.5.0 // indirect
 	github.com/nats-io/nkeys v0.4.7 // indirect
 	github.com/nats-io/nuid v1.0.1 // indirect

go.sum

@@ -1,14 +1,12 @@
-filippo.io/edwards25519 v1.1.0 h1:FNf4tywRC1HmFuKW5xopWpigGjJKiJSV0Cqo0cJWDaA=
-filippo.io/edwards25519 v1.1.0/go.mod h1:BxyFTGdWcka3PhytdK4V28tE5sGfRvvvRV7EaN4VDT4=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dolmen-go/jsonptr v0.0.0-20240328010033-38530b85cd9c h1:LGkyveR0n7E9ablreKxp29yE/4RdlCs/c3BT6BpxujY=
 github.com/dolmen-go/jsonptr v0.0.0-20240328010033-38530b85cd9c/go.mod h1:+6ZQtcQuiOH4ATMF+4885rhnE3FaM++MhE7m7vM302s=
 github.com/eclipse/paho.mqtt.golang v1.4.3 h1:2kwcUGn8seMUfWndX0hGbvH8r7crgcJguQNCyp70xik=
 github.com/eclipse/paho.mqtt.golang v1.4.3/go.mod h1:CSYvoAlsMkhYOXh/oKyxa8EcBci6dVkLCbo5tTC1RIE=
-github.com/go-sql-driver/mysql v1.8.1 h1:LedoTUt/eveggdHS9qUFC1EFSa8bU2+1pZjSRpvNJ1Y=
-github.com/go-sql-driver/mysql v1.8.1/go.mod h1:wEBSXgmK//2ZFJyE+qWnIsVGmvmEKlqwuVSjsCm7DZg=
+github.com/go-sql-driver/mysql v1.6.0 h1:BCTh4TKNUYmOmMUcQ3IipzF5prigylS7XXjEkfCHuOE=
+github.com/go-sql-driver/mysql v1.6.0/go.mod h1:DCzpHaOWr8IXmIStZouvnhqoel9Qv2LBy8hT2VhHyBg=
 github.com/gogo/protobuf v1.3.2 h1:Ov1cvc58UF3b5XjBnZv7+opcTcQFZebYjWzi34vdm4Q=
 github.com/gogo/protobuf v1.3.2/go.mod h1:P1XiOD3dCwIKUDQYPy72D8LYyHL2YPYrpS2s69NZV8Q=
 github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=