Fix typo in 'IServiceProvider' type

Author: Sergio0694

components/Extensions.DependencyInjection/CommunityToolkit.Extensions.DependencyInjection.SourceGenerators/ServiceProviderGenerator.Execute.cs

@@ -222,7 +222,7 @@ public static CompilationUnitSyntax GetSyntax(ServiceCollectionInfo info)
                     .AddModifiers(Token(SyntaxKind.StaticKeyword))
                     .AddParameterListParameters(
                         Parameter(Identifier("services"))
-                        .WithType(IdentifierName("global::System.IserviceProvider")))
+                        .WithType(IdentifierName("global::System.IServiceProvider")))
                     .AddBodyStatements(
                         ReturnStatement(
                             ObjectCreationExpression(IdentifierName(serviceInfo.ImplementationFullyQualifiedTypeName))