LibWeb: Fix a few const-ness issues

Author: https://github.com/mattco98
Commit: c0b2fa74ac
Pull-request: https://github.com/SerenityOS/serenity/pull/17620
Issue: https://github.com/SerenityOS/serenity/issues/16988
Reviewed-by: https://github.com/ADKaster ✅
Reviewed-by: https://github.com/linusg

Userland/Libraries/LibWeb/Fetch/Infrastructure/FetchParams.h

@@ -34,8 +34,8 @@ public:
     [[nodiscard]] JS::NonnullGCPtr<FetchController> controller() const { return m_controller; }
     [[nodiscard]] JS::NonnullGCPtr<FetchTimingInfo> timing_info() const { return m_timing_info; }
 
-    [[nodiscard]] JS::NonnullGCPtr<FetchAlgorithms> algorithms() const { return m_algorithms; }
-    void set_algorithms(JS::NonnullGCPtr<FetchAlgorithms> algorithms) { m_algorithms = algorithms; }
+    [[nodiscard]] JS::NonnullGCPtr<FetchAlgorithms const> algorithms() const { return m_algorithms; }
+    void set_algorithms(JS::NonnullGCPtr<FetchAlgorithms const> algorithms) { m_algorithms = algorithms; }
 
     [[nodiscard]] TaskDestination& task_destination() { return m_task_destination; }
     [[nodiscard]] TaskDestination const& task_destination() const { return m_task_destination; }
@@ -74,7 +74,7 @@ private:
     // https://fetch.spec.whatwg.org/#fetch-params-process-response-consume-body
     // process response consume body (default null)
     //     Null or an algorithm.
-    JS::NonnullGCPtr<FetchAlgorithms> m_algorithms;
+    JS::NonnullGCPtr<FetchAlgorithms const> m_algorithms;
 
     // https://fetch.spec.whatwg.org/#fetch-params-task-destination
     // task destination (default null)