fix(@rdfjs/namespace): builder can be called without params (#41231)

types/rdfjs__namespace/index.d.ts

@@ -9,7 +9,7 @@ declare function namespace(baseIRI: string, options?: namespace.BuilderOptions):
 
 declare namespace namespace {
     interface NamespaceBuilder {
-        (property: TemplateStringsArray | string): NamedNode;
+        (property?: TemplateStringsArray | string): NamedNode;
 
         readonly [property: string]: NamedNode;
     }

types/rdfjs__namespace/rdfjs__namespace-tests.ts

@@ -14,3 +14,4 @@ const node3: NamedNode = builder1('Thing');
 const node4: NamedNode = builder1('url');
 const node5: NamedNode = builder1`'Thing'`;
 const node6: NamedNode = builder1`url`;
+const node7: NamedNode = builder1();