update dependencies and bump version to 0.1.7+45

- Bump version to `0.1.7+45` and update SDK constraint to `>=3.8.0 <4.0.0`.
- Update numerous dependencies

lib/api/marianumcloud/talk/sendMessage/sendMessageParams.g.dart

@@ -15,5 +15,5 @@ SendMessageParams _$SendMessageParamsFromJson(Map<String, dynamic> json) =>
 Map<String, dynamic> _$SendMessageParamsToJson(SendMessageParams instance) =>
     <String, dynamic>{
       'message': instance.message,
-      if (instance.replyTo case final value?) 'replyTo': value,
+      'replyTo': ?instance.replyTo,
     };