Update to updated SPIRV-Tools v2023.1

Includes bugfix https://github.com/KhronosGroup/SPIRV-Tools/pull/5049
diff --git a/known_good.json b/known_good.json
index 0094805..90e11c8f 100644
--- a/known_good.json
+++ b/known_good.json
@@ -46,7 +46,7 @@
       "site" : "github",
       "subrepo" : "KhronosGroup/SPIRV-Tools",
       "subdir" : "third_party/spirv-tools",
-      "commit" : "0e6fbba7762c071118b3e84258a358ede31fb609"
+      "commit" : "63de608daeb7e91fbea6d7477a50debe7cac57ce"
     }
   ]
 }