Fix nullable

GerbilManagerWebAPI/Dtos/CreateLitterDto.cs

@@ -5,7 +5,7 @@ namespace GerbilManagerWebAPI.Dtos
         public required string Name { get; init; }
         public required DateTime Date { get; init; }
         public int? Strength { get; init; }
-        public Guid Father { get; init; }
-        public Guid Mother { get; init; }
+        public Guid? Father { get; init; }
+        public Guid? Mother { get; init; }
     }
 }

GerbilManagerWebAPI/Dtos/UpdateBreederDto.cs

@@ -3,6 +3,6 @@ namespace GerbilManagerWebAPI.Dtos
 {
     public record UpdateBreederDto
     {
-        public string Name { get; init; }
+        public string? Name { get; init; }
     }
 }

GerbilManagerWebAPI/Dtos/UpdateGerbilDto.cs

@@ -2,9 +2,9 @@ namespace GerbilManagerWebAPI.Dtos
 {
     public record UpdateGerbilDto
     {
-        public string Name { get; init; }
-        public GenderDto Gender { get; init; }
-        public LitterDto Litter { get; init; }
-        public BreederDto Breeder { get; init; }
+        public string? Name { get; init; }
+        public GenderDto? Gender { get; init; }
+        public LitterDto? Litter { get; init; }
+        public BreederDto? Breeder { get; init; }
     }
 }

GerbilManagerWebAPI/Dtos/UpdateLitterDto.cs

@@ -3,10 +3,10 @@ namespace GerbilManagerWebAPI.Dtos
 {
     public record UpdateLitterDto
     {
-        public string Name { get; init; }
-        public DateTime Date { get; init; }
-        public int Strength { get; init; }
-        public Guid Father { get; init; }
-        public Guid Mother { get; init; }
+        public string? Name { get; init; }
+        public DateTime? Date { get; init; }
+        public int? Strength { get; init; }
+        public Guid? Father { get; init; }
+        public Guid? Mother { get; init; }
     }
 }