Update ApiCompat baseline

Author: simonrozsival

src/libraries/shims/ApiCompatBaseline.PreviousNetCoreApp.txt

@@ -226,8 +226,6 @@ CannotRemoveAttribute : Attribute 'System.Runtime.CompilerServices.IsReadOnlyAtt
 CannotRemoveAttribute : Attribute 'System.Runtime.CompilerServices.IsReadOnlyAttribute' exists on 'System.Numerics.Vector<T>.ToString(System.String, System.IFormatProvider)' in the contract but not the implementation.
 CannotRemoveAttribute : Attribute 'System.Runtime.CompilerServices.IsReadOnlyAttribute' exists on 'System.Numerics.Vector<T>.TryCopyTo(System.Span<System.Byte>)' in the contract but not the implementation.
 CannotRemoveAttribute : Attribute 'System.Runtime.CompilerServices.IsReadOnlyAttribute' exists on 'System.Numerics.Vector<T>.TryCopyTo(System.Span<T>)' in the contract but not the implementation.
-Compat issues with assembly System.ObjectModel:
-TypesMustExist : Type 'System.Collections.ObjectModel.ReadOnlyDictionary<TKey, TValue>' does not exist in the implementation but it does exist in the contract.
 Compat issues with assembly System.Reflection.Emit:
 CannotChangeAttribute : Attribute 'System.Diagnostics.CodeAnalysis.DynamicallyAccessedMembersAttribute' on 'System.Reflection.Emit.EnumBuilder.GetMember(System.String, System.Reflection.MemberTypes, System.Reflection.BindingFlags)' changed from '[DynamicallyAccessedMembersAttribute(DynamicallyAccessedMemberTypes.All)]' in the contract to '[DynamicallyAccessedMembersAttribute(DynamicallyAccessedMemberTypes.NonPublicConstructors | DynamicallyAccessedMemberTypes.NonPublicEvents | DynamicallyAccessedMemberTypes.NonPublicFields | DynamicallyAccessedMemberTypes.NonPublicMethods | DynamicallyAccessedMemberTypes.NonPublicNestedTypes | DynamicallyAccessedMemberTypes.NonPublicProperties | DynamicallyAccessedMemberTypes.PublicConstructors | DynamicallyAccessedMemberTypes.PublicEvents | DynamicallyAccessedMemberTypes.PublicFields | DynamicallyAccessedMemberTypes.PublicMethods | DynamicallyAccessedMemberTypes.PublicNestedTypes | DynamicallyAccessedMemberTypes.PublicProperties)]' in the implementation.
 CannotChangeAttribute : Attribute 'System.Diagnostics.CodeAnalysis.DynamicallyAccessedMembersAttribute' on 'System.Reflection.Emit.EnumBuilder.GetMembers(System.Reflection.BindingFlags)' changed from '[DynamicallyAccessedMembersAttribute(DynamicallyAccessedMemberTypes.All)]' in the contract to '[DynamicallyAccessedMembersAttribute(DynamicallyAccessedMemberTypes.NonPublicConstructors | DynamicallyAccessedMemberTypes.NonPublicEvents | DynamicallyAccessedMemberTypes.NonPublicFields | DynamicallyAccessedMemberTypes.NonPublicMethods | DynamicallyAccessedMemberTypes.NonPublicNestedTypes | DynamicallyAccessedMemberTypes.NonPublicProperties | DynamicallyAccessedMemberTypes.PublicConstructors | DynamicallyAccessedMemberTypes.PublicEvents | DynamicallyAccessedMemberTypes.PublicFields | DynamicallyAccessedMemberTypes.PublicMethods | DynamicallyAccessedMemberTypes.PublicNestedTypes | DynamicallyAccessedMemberTypes.PublicProperties)]' in the implementation.
@@ -305,4 +303,4 @@ CannotRemoveAttribute : Attribute 'System.Diagnostics.CodeAnalysis.DynamicallyAc
 CannotChangeAttribute : Attribute 'System.AttributeUsageAttribute' on 'System.Text.Json.Serialization.JsonConverterAttribute' changed from '[AttributeUsageAttribute(AttributeTargets.Class | AttributeTargets.Enum | AttributeTargets.Field | AttributeTargets.Property | AttributeTargets.Struct, AllowMultiple=false)]' in the contract to '[AttributeUsageAttribute(AttributeTargets.Class | AttributeTargets.Enum | AttributeTargets.Field | AttributeTargets.Interface | AttributeTargets.Property | AttributeTargets.Struct, AllowMultiple=false)]' in the implementation.
 Compat issues with assembly System.Threading.Tasks.Extensions:
 CannotChangeAttribute : Attribute 'System.AttributeUsageAttribute' on 'System.Runtime.CompilerServices.AsyncMethodBuilderAttribute' changed from '[AttributeUsageAttribute(AttributeTargets.Class | AttributeTargets.Delegate | AttributeTargets.Enum | AttributeTargets.Interface | AttributeTargets.Struct, Inherited=false, AllowMultiple=false)]' in the contract to '[AttributeUsageAttribute(AttributeTargets.Class | AttributeTargets.Delegate | AttributeTargets.Enum | AttributeTargets.Interface | AttributeTargets.Method | AttributeTargets.Struct, Inherited=false, AllowMultiple=false)]' in the implementation.
-Total Issues: 287
+Total Issues: 286