Bug 300747 – [WTF] Fix -Wc++23-lambda-attributes warnings

• Status: RESOLVED
• Resolution: FIXED
• Component: Web Template Framework

[David Kilzer (:ddkilzer)]

Fix -Wc++23-lambda-attributes warnings in various WTF source files.

```
WebKitBuild/Release/usr/local/include/wtf/ThreadSafeWeakPtr.h:92:44: warning: an attribute specifier sequence in this position is a C++23 extension [-Wc++23-lambda-attributes]
   92 |         auto deleteObject = [this, object] SUPPRESS_UNCOUNTED_LAMBDA_CAPTURE {
      |                                            ^

WebKitBuild/Release/usr/local/include/wtf/ThreadSafeWeakPtr.h:244:44: warning: an attribute specifier sequence in this position is a C++23 extension [-Wc++23-lambda-attributes]
  244 |                 auto deleteObject = [this] SUPPRESS_UNCOUNTED_LAMBDA_CAPTURE {
      |                                            ^

WebKitBuild/Release/usr/local/include/wtf/RunLoop.h:208:71: warning: an attribute specifier sequence in this position is a C++23 extension [-Wc++23-lambda-attributes]
  208 |             : Timer(WTFMove(runLoop), description, [object, function] SUPPRESS_UNCOUNTED_LAMBDA_CAPTURE { // The Timer's owner is expected to cancel the Timer in its destructor.
      |                                                                       ^

WebKitBuild/Release/usr/local/include/wtf/RunLoop.h:218:71: warning: an attribute specifier sequence in this position is a C++23 extension [-Wc++23-lambda-attributes]
  218 |             : Timer(WTFMove(runLoop), description, [object, function] SUPPRESS_UNCOUNTED_LAMBDA_CAPTURE { // The Timer's owner is expected to cancel the Timer in its destructor.
      |                                                                       ^
```

[Radar WebKit Bug Importer]

<rdar://problem/162639803>

[David Kilzer (:ddkilzer)]

Pull request: https://github.com/WebKit/WebKit/pull/52369

[EWS]

Committed 301598@main (1e7334780f9b): <https://commits.webkit.org/301598@main>

Reviewed commits have been landed. Closing PR #52369 and removing active labels.