Fix building with gcc 13

[Biswa96]

This fixes the following compiler error.

t_js_generator.cc:48:14: error: 'int64_t' does not name a type
   48 | static const int64_t max_safe_integer = 0x1fffffffffffff;
      |              ^~~~~~~
t_js_generator.cc:50:14: error: 'int64_t' does not name a type
   50 | static const int64_t min_safe_integer = -max_safe_integer;
      |              ^~~~~~~

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