Fix artboard pieces slowly popping in.

Fixes #4351
Fixes #4804

This was due to the dependency between the root artboard's hierarchy and the nested artboard itself.

We would:
update nested artboards (NestedArtboard::advance)
update hierarchy (Artboard::updateComponents)

The problem is that this hierarchy update would/could change the opacity of those nested artboards. So nested artboard opacity would always be behind by a frame.

We apparently already caught this in the editor as the editor does it the right way around:
update hierarchy (Artboard::updateComponents)
update nested artboards (NestedArtboard::advance)

Diffs=
f1ddd88d4 Fix artboard pieces slowly popping in. (#4818)

.rive_head

diff --git a/.rive_head b/.rive_head
index 389e070..859ae8c 100644
--- a/.rive_head
+++ b/.rive_head
@@ -1 +1 @@
-3039909c2ab6ad363d1605276f325f7027de7d72
+f1ddd88d4e3b6d33adb85154b50dc86d0c3079fd

src/artboard.cpp

diff --git a/src/artboard.cpp b/src/artboard.cpp
index 14fd0ea..d380660 100644
--- a/src/artboard.cpp
+++ b/src/artboard.cpp
@@ -466,11 +466,15 @@
 
 bool Artboard::advance(double elapsedSeconds)
 {
+    bool didUpdate = updateComponents();
     for (auto nestedArtboard : m_NestedArtboards)
     {
-        nestedArtboard->advance((float)elapsedSeconds);
+        if (nestedArtboard->advance((float)elapsedSeconds))
+        {
+            didUpdate = true;
+        }
     }
-    return updateComponents();
+    return didUpdate;
 }
 
 Core* Artboard::hitTest(HitInfo* hinfo, const Mat2D* xform)