[NO-TICKET] Do not reference rb_gc_force_recycle on Ruby 3.1+

**What does this PR do?**

This PR avoids referencing `rb_gc_force_recycle` on Rubies where this
method is a no-op.

**Motivation:**

This method will be removed in Ruby 3.4
( ruby/ruby#10324 ) so we should stop
referencing it.

**Additional Notes:**

N/A

**How to test the change?**

Validate that CI is still green.

ext/datadog_profiling_native_extension/stack_recorder.c

@@ -921,7 +921,9 @@ static VALUE _native_debug_heap_recorder(DDTRACE_UNUSED VALUE _self, VALUE recor
 // This method exists only to enable testing Datadog::Profiling::StackRecorder behavior using RSpec.
 // It SHOULD NOT be used for other purposes.
 static VALUE _native_gc_force_recycle(DDTRACE_UNUSED VALUE _self, VALUE obj) {
-  rb_gc_force_recycle(obj);
+  #ifdef HAVE_WORKING_RB_GC_FORCE_RECYCLE
+    rb_gc_force_recycle(obj);
+  #endif
   return Qnil;
 }
 #pragma GCC diagnostic pop