radv: Update CTS version.

CC: 20.2 <mesa-stable@lists.freedesktop.org>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6444>
diff --git a/src/amd/vulkan/radv_device.c b/src/amd/vulkan/radv_device.c
index ba71cf3..5139cf6 100644
--- a/src/amd/vulkan/radv_device.c
+++ b/src/amd/vulkan/radv_device.c
@@ -1645,7 +1645,7 @@
 	p->conformanceVersion = (VkConformanceVersion) {
 		.major = 1,
 		.minor = 2,
-		.subminor = 0,
+		.subminor = 3,
 		.patch = 0,
 	};