use int32 instead of uint32

proto/caosdb/info/v1alpha1/main.proto

@@ -28,11 +28,11 @@ package caosdb.info.v1alpha1;
 // The version of an agent (following SemVer 2.0.0)
 message VersionInfo {
   // Major version number
-  uint32 major = 1;
+  int32 major = 1;
   // Minor version number
-  uint32 minor = 2;
+  int32 minor = 2;
   // Patch version
-  uint32 patch = 3;
+  int32 patch = 3;
   // Pre-release version
   string pre_release = 4;
   // Build metadata