Fix compiling in GCC 13

[lilleyse]

A few changes so that cesium-native compiles in GCC 13 (I tested with 13.1.0). I confirmed that it still compiles with GCC 9 and GCC 11.

• Updated Draco to pick up this fix: https://github.com/google/draco/issues/966
• Ignore -Wstringop-overflow when including picosha2.h
• Ignore -Wdangling-reference which was causing false positives in test files
• Include <cstdint> in more places

[timoore]

I would turn off those warnings globally at the CMake level rather than in just the files where they are causing false positives now. I believe that these have a pretty bad reputation.

[lilleyse]

I moved dangling-reference to CMake but kept stringop-overflow in the code since there are already other pragmas surrounding <picosha2.h>

[j9liu]

I don't have GCC set up to try this locally, but these changes look good + make sense to me. Thanks @lilleyse !