Clamping color stops.

Addresses issue #6034 where color stops can sometimes be just outside the 0-1 range.

Diffs=
6ee7cea9e Clamping color stops. (#6052)

Co-authored-by: Luigi Rosso <luigi-rosso@users.noreply.github.com>

.rive_head

diff --git a/.rive_head b/.rive_head
index 4ffe9fa..e292a4a 100644
--- a/.rive_head
+++ b/.rive_head
@@ -1 +1 @@
-bb00ec119d2ced89395c70e718419aa970b312d8
+6ee7cea9edb3efb81318bc5a8a1db2c6a28c011a

src/shapes/paint/linear_gradient.cpp

diff --git a/src/shapes/paint/linear_gradient.cpp b/src/shapes/paint/linear_gradient.cpp
index 6618c90..aa49c94 100644
--- a/src/shapes/paint/linear_gradient.cpp
+++ b/src/shapes/paint/linear_gradient.cpp
@@ -123,7 +123,7 @@
     for (size_t i = 0; i < count; ++i)
     {
         colors[i] = colorModulateOpacity(m_Stops[i]->colorValue(), ro);
-        stops[i] = m_Stops[i]->position();
+        stops[i] = std::max(0.0f, std::min(m_Stops[i]->position(), 1.0f));
     }
 
     makeGradient(renderPaint, start, end, colors, stops, count);