Vulkan: fix ProgramVk never releasing uniform buffers

src/libANGLE/renderer/vulkan/ProgramVk.cpp

@@ -119,6 +119,8 @@ angle::Result SyncDefaultUniformBlock(ContextVk *contextVk,
                                       uint32_t *outOffset,
                                       bool *outBufferModified)
 {
+    dynamicBuffer->releaseRetainedBuffers(contextVk->getRenderer());
+
     ASSERT(!bufferData.empty());
     uint8_t *data       = nullptr;
     VkBuffer *outBuffer = nullptr;