stb_ds: Fix d[i] << 24 undefined behaviour due to overflow
#1682
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Because of int promotion, `d[i] << 24` overflows an int, resulting in UB. Found via ubsan in clang 18: ``` stb/stb_ds.h:1124:67: runtime error: left shift of 255 by 24 places cannot be represented in type 'int' SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior stb/stb_ds.h:1124:67 ```
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Because of int promotion,
d[i] << 24overflows an int, resulting in UB.Found via ubsan in clang 18: